How do I adjust dim speed?

[Blackbird]

I want to close my bedroom door and have the bedroom lights to ramp down for 21 seconds.

 

I know how to adjust the scene to change the ramp speed when the switch is pressed and I know how the dim feature works in the programs but the dim is too quick.

 

I just want to close my bedroom door (which has a door sensor) and have the lights slowly dim without hitting the light switch

[G W]

I'd build a Scene and have a program trigger the running of the Scene.

 

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[Blackbird]

Perfect.  Thanks Gary