question for those doing or have done p90x

Howdy,

I just started p90x (finished chest and back for the first time), and am curious how long it took for you to do the exercises properly and with few or no breaks during the sets.

I am big, but athletic, have done plenty of working out in the past, just not in good shape right now. That said, I feel I should be pretty capable of even the harder routines, but naturally there will be some struggle.