2XL - Try this. If your base turn is rate 1, you travel for 1 minute at your your average groundspeed. Crosswind into the circuit means the turn is 180 degrees plus twice the average drift. If you are looking at circling approach base turns, there is a lot to consider, including terrain that can kill you. There are some aircraft / configurations / airports where the GPWS will give a "too low flap" caution, a few seconds before you hit terrain on downwind.