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Questions About Ian King's Book

I am currently in the middle of reading “Get Buffed” and have a few questions that I wasn’t sure of. In the book it says that training time should be between 20-60 minutes with 20 being optimal for neural and 60 optimal for metabolic training. Now here is my question: Does it really have to be that strict, because i find it extremely hard to work out for less than an hour and a half. i do talk to friends and stuff in the gym and that probably accounts for some of the time but is it still bad to expand your training session over a longer period of time even if your aren’t working out the whole time? Also, does that time period include doing stuff such as abs, calves, etc… or is it just for the main stuff. My other question is about the number of sets. I am a powerlifter so my optimal range is between 5-15 sets per session. Does that also include abs, calves, forearms, etc. I usually like doing about 5 sets of both calves and abs and I usually do them on my leg days so does that take away 10 of my 15 total sets I can do? Other t-men who have read this book please help me out, I am kind of confusd. Thanks, Nic