how many hands do you average per PT 'session'?

[crockpot]

i was browsing my PT 5/10 stats today and noticed i'm averaging around 30 hands per table per session. i've always valued game selection heavily, but this still seems low (although it's skewed some by tables that get bad after only a few hands).

am i changing tables way too often? it usually takes a couple of minutes to find a new one, so i figure it may be -EV to be switching 10 times an hour if it means getting dealt 50 less hands. thoughts?