Pull down menu to select delay?

[fellinga]

@spawnreaper

First select time on a pull down menu on the dashboard with options to select from 1 to 10 hours value.
Push button to activate.
First select a time then push the button. the relay connected to the pi turns on.
Depending on the time selected, wait that amount of time, then turn the relay off.
(if possible a countdown on the dashboard, but less important)

@JGKK mentioned this already above, but I just wanted to point out that this is, besides the push button, exactly what the countdown-timer-switch does. Do you need to activate the timer via a button?