diff --git a/CHANGELOG.md b/CHANGELOG.md
index 146ceff7e..fa5df9e0f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,7 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Added
 
-- Wizards for defining Number Format masks for Dates and Times. [PR #3458](https://github.com/PHPOffice/PhpSpreadsheet/pull/3458)
+- Wizards for defining Number Format masks for Dates and Times, including Durations/Intervals. [PR #3458](https://github.com/PHPOffice/PhpSpreadsheet/pull/3458)
 - Specify data type in html tags. [Issue #3444](https://github.com/PHPOffice/PhpSpreadsheet/issues/3444) [PR #3445](https://github.com/PHPOffice/PhpSpreadsheet/pull/3445)
 
 ### Changed
diff --git a/src/PhpSpreadsheet/Style/NumberFormat/Wizard/Duration.php b/src/PhpSpreadsheet/Style/NumberFormat/Wizard/Duration.php
new file mode 100644
index 000000000..b81f77acb
--- /dev/null
+++ b/src/PhpSpreadsheet/Style/NumberFormat/Wizard/Duration.php
@@ -0,0 +1,153 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard;
+
+class Duration extends DateTimeWizard
+{
+    public const DAYS_DURATION = 'd';
+
+    /**
+     * Hours as a duration (can exceed 24), e.g. 29.
+     */
+    public const HOURS_DURATION = '[h]';
+
+    /**
+     * Hours without a leading zero, e.g. 9.
+     */
+    public const HOURS_SHORT = 'h';
+
+    /**
+     * Hours with a leading zero, e.g. 09.
+     */
+    public const HOURS_LONG = 'hh';
+
+    /**
+     * Minutes as a duration (can exceed 60), e.g. 109.
+     */
+    public const MINUTES_DURATION = '[m]';
+
+    /**
+     * Minutes without a leading zero, e.g. 5.
+     */
+    public const MINUTES_SHORT = 'm';
+
+    /**
+     * Minutes with a leading zero, e.g. 05.
+     */
+    public const MINUTES_LONG = 'mm';
+
+    /**
+     * Seconds as a duration (can exceed 60), e.g. 129.
+     */
+    public const SECONDS_DURATION = '[s]';
+
+    /**
+     * Seconds without a leading zero, e.g. 2.
+     */
+    public const SECONDS_SHORT = 's';
+
+    /**
+     * Seconds with a leading zero, e.g. 02.
+     */
+    public const SECONDS_LONG = 'ss';
+
+    protected const DURATION_BLOCKS = [
+        self::DAYS_DURATION,
+        self::HOURS_DURATION,
+        self::HOURS_LONG,
+        self::HOURS_SHORT,
+        self::MINUTES_DURATION,
+        self::MINUTES_LONG,
+        self::MINUTES_SHORT,
+        self::SECONDS_DURATION,
+        self::SECONDS_LONG,
+        self::SECONDS_SHORT,
+    ];
+
+    protected const DURATION_MASKS = [
+        self::DAYS_DURATION => self::DAYS_DURATION,
+        self::HOURS_DURATION => self::HOURS_SHORT,
+        self::MINUTES_DURATION => self::MINUTES_LONG,
+        self::SECONDS_DURATION => self::SECONDS_LONG,
+    ];
+
+    protected const DURATION_DEFAULTS = [
+        self::HOURS_LONG => self::HOURS_DURATION,
+        self::HOURS_SHORT => self::HOURS_DURATION,
+        self::MINUTES_LONG => self::MINUTES_DURATION,
+        self::MINUTES_SHORT => self::MINUTES_DURATION,
+        self::SECONDS_LONG => self::SECONDS_DURATION,
+        self::SECONDS_SHORT => self::SECONDS_DURATION,
+    ];
+
+    public const SEPARATOR_COLON = ':';
+    public const SEPARATOR_SPACE_NONBREAKING = "\u{a0}";
+    public const SEPARATOR_SPACE = ' ';
+
+    public const DURATION_DEFAULT = [
+        self::HOURS_DURATION,
+        self::MINUTES_LONG,
+        self::SECONDS_LONG,
+    ];
+
+    /**
+     * @var string[]
+     */
+    protected array $separators;
+
+    /**
+     * @var string[]
+     */
+    protected array $formatBlocks;
+
+    protected bool $durationIsSet = false;
+
+    /**
+     * @param null|string|string[] $separators
+     *        If you want to use the same separator for all format blocks, then it can be passed as a string literal;
+     *           if you wish to use different separators, then they should be passed as an array.
+     *        If you want to use only a single format block, then pass a null as the separator argument
+     */
+    public function __construct($separators = self::SEPARATOR_COLON, string ...$formatBlocks)
+    {
+        $separators ??= self::SEPARATOR_COLON;
+        $formatBlocks = (count($formatBlocks) === 0) ? self::DURATION_DEFAULT : $formatBlocks;
+
+        $this->separators = $this->padSeparatorArray(
+            is_array($separators) ? $separators : [$separators],
+            count($formatBlocks) - 1
+        );
+        $this->formatBlocks = array_map([$this, 'mapFormatBlocks'], $formatBlocks);
+
+        if ($this->durationIsSet === false) {
+            // We need at least one duration mask, so if none has been set we change the first mask element
+            //    to a duration.
+            $this->formatBlocks[0] = self::DURATION_DEFAULTS[mb_strtolower($this->formatBlocks[0])];
+        }
+    }
+
+    private function mapFormatBlocks(string $value): string
+    {
+        // Any duration masking codes are returned as lower case values
+        if (in_array(mb_strtolower($value), self::DURATION_BLOCKS, true)) {
+            if (array_key_exists(mb_strtolower($value), self::DURATION_MASKS)) {
+                if ($this->durationIsSet) {
+                    // We should only have a single duration mask, the first defined in the mask set,
+                    //    so convert any additional duration masks to standard time masks.
+                    $value = self::DURATION_MASKS[mb_strtolower($value)];
+                }
+                $this->durationIsSet = true;
+            }
+
+            return mb_strtolower($value);
+        }
+
+        // Wrap any string literals in quotes, so that they're clearly defined as string literals
+        return $this->wrapLiteral($value);
+    }
+
+    public function format(): string
+    {
+        return implode('', array_map([$this, 'intersperse'], $this->formatBlocks, $this->separators));
+    }
+}
diff --git a/tests/PhpSpreadsheetTests/Style/NumberFormat/Wizard/DurationTest.php b/tests/PhpSpreadsheetTests/Style/NumberFormat/Wizard/DurationTest.php
new file mode 100644
index 000000000..1467b3457
--- /dev/null
+++ b/tests/PhpSpreadsheetTests/Style/NumberFormat/Wizard/DurationTest.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Style\NumberFormat\Wizard;
+
+use PhpOffice\PhpSpreadsheet\Style\NumberFormat\Wizard\Duration;
+use PHPUnit\Framework\TestCase;
+
+class DurationTest extends TestCase
+{
+    /**
+     * @dataProvider providerTime
+     *
+     * @param null|string|string[] $separators
+     * @param string[] $formatBlocks
+     */
+    public function testTime(string $expectedResult, $separators = null, array $formatBlocks = []): void
+    {
+        $wizard = new Duration($separators, ...$formatBlocks);
+        self::assertSame($expectedResult, (string) $wizard);
+    }
+
+    public function providerTime(): array
+    {
+        return [
+            ['[h]:mm:ss', Duration::SEPARATOR_COLON, [Duration::HOURS_DURATION, Duration::MINUTES_LONG, Duration::SECONDS_LONG]],
+            ['[h]:mm', Duration::SEPARATOR_COLON, [Duration::HOURS_DURATION, Duration::MINUTES_LONG]],
+            ['[m]:ss', Duration::SEPARATOR_COLON, [Duration::MINUTES_DURATION, Duration::SECONDS_DURATION]],
+            ['[h]:mm:ss', Duration::SEPARATOR_COLON, [Duration::HOURS_LONG, Duration::MINUTES_LONG, Duration::SECONDS_LONG]],
+            ['[h]:mm', Duration::SEPARATOR_COLON, [Duration::HOURS_LONG, Duration::MINUTES_LONG]],
+            ["d\u{a0}h:mm", [Duration::SEPARATOR_SPACE_NONBREAKING, Duration::SEPARATOR_COLON], [Duration::DAYS_DURATION, Duration::HOURS_DURATION, Duration::MINUTES_LONG]],
+            ['[h]:mm:ss', null, [Duration::HOURS_DURATION, Duration::MINUTES_LONG, Duration::SECONDS_LONG]],
+            ['[h]:mm:ss'],
+        ];
+    }
+}