I'm almost done with the BR Gchem and Physics books. The physics chapters are pretty easy to get through. Most chapters have a fairly short content review and 70 questions at the end. It takes maybe 4 hours to do a chapter thoroughly.
GChem on the other hand is a total pain sometimes, but worth it. The length of the review along with the 100 questions after each section takes me about 6-7 hours to complete. Although I take good notes as I'm going through it for my second pass.
Someone was asking if they could get through both the GC and physics books in 2 weeks. I really doubt it, unless you only do half the questions, which would be a complete disservice to the books. The questions at the end is what makes TBR so damn good. Half the learning is in the review, the other half in doing the questions and reading the explainations. I guess it's possible, but I doubt you'd retain much by going so quick. I would take atleast 3 weeks to get through both physics and gchem properly. 1 chapter a day, 10 chapters per subject. It's harder than it sounds, really.