My BFL weight workouts are much longer than recommended--about 65 or 70 minutes--and I am progressing well. The extra time comes from working out with a partner...it takes time to change the weights and for the other person to do her set.

Ideally I would like to do the workouts within the recommended time, but it just hasn't happened--and so far I have lost about 10 lbs in 6 weeks and my lifts have gone up dramatically.

However, I do extra cardio, partially to compensate for the lost "aerobic" effect because I do longer workouts and therefore get to rest more than he accounts for in the plan.