2 min. @ 1/2 max depth, 1 min. @ 30, 3-5 min. @ 15-20 on all dives deeper than 90ft.
All others with a square profile: 2 min. @ 1/2 max., 3-5 @ 15-20.
Only time I don't do this is in a place like Bonaire where many of the reefs are nothing but a long sloping ascent.
P.S. It was covered in my...