blast

i just bought myself a race / trackbike,so want to know if i should leave the tyre warmers turned on in between sessions all the time?
as some guys are telling me once you come of the track to leave them cool down slowly by putting the warmers on but not turned on (power) then 20 mins before you go out ,turn power on ?is this the correct way of doing this? as iam running slicks and want to do it the best way.thanks OLC