Possible to have Alexa how long to keep a device on?

[Efrost]

I will be putting a 1500w outdoor heater on our balcony. I do not want this to stay on all night by accident, so here’s what I’d like to do. I can set up a routine called heater, so if I trigger that routine, I want Alexa to ask how long I’d like the heater on, and then depending on the answer (10, 20, 30 minutes), I’d like to have Alexa shut that unit off at that time period.
Is there a way to do this?
Any help would be great.

[renegade600]

you can try using the sleep timer in the routine.