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Is it possible to get the length of the current scene in a driver?

I'm trying to make properties loop, without having to edit the drivers if I change the first or last frame. I'm coming from an After Effects background, so what I want is something equivalent to AE expression's thisComp.duration

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Just paste this into your driver's field:

bpy.context.scene.frame_end - bpy.context.scene.frame_start

i put it in my x-scale:

enter image description here

Note: works only if your animation is playing.

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