Controlled? or calculated? Take Off Time.
CTOT=slot time. The slot being 15minutes wide, (-5/+10) around the time.
So be ready to push allowing taxi to, and be ready for departure at the hold
-5/+10mins on the CTOT.
As I understood it.
Why it is -5/+10 would be interesting to know, in the 'headful of useless factoids'