b) 20 minute time limit
I love it! It's the Iron Gym Total Upper Body Workout Bar. Every time I walk by I have to do a chin up. It's great to have a bar right at home. And this one isn't permanently attached to the doorframe. I can take it down and put it up whenever. It took, like, 10 minutes to assemble and then I was doing chin ups. Whoo-hoo!