There’s no direct way to change the duration value of a timeline at runtime, however since there is a way to change the playback rate of a timeline, you can use this simple workaround:
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Make your timeline 1 second in duration.
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Create a float variable that will act as the new, dynamic duration of your timeline.
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Get a reference to your timeline (Get )
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Set Playback Rate on your timeline to 1 divided by your new float variable.
Since your timeline is 1 second long, dividing 1 by the desired duration will result in your timeline playing for exactly that desired duration (1 / 4 = 0.25, 1 second timeline playing at 0.25 speed = 4 seconds).
Timelines tick once per frame, regardless of their playback rate, so this effectively changes the timeline’s duration.
