Well....
I guess we could have 10 pages of "I leave them on", "I leave them off". It depends on type and Company SOP. I previously flew 75/76 and generally left them on, but now on the 321/330 take them off once one of the pilots has checked they are in. A sensible turnround time after a Med auto brake landing on the 321 or the the 330 in Vegas (without fans) would not be achievable if left on. After signing the a/c over to the engineers; that's up to them.