I would like a version for 120 or 150 minutes. I've been using binaural beats for years so it would not be too much for me and the version with the extended duration will be more suitable to use at work, where you can't really take a break every 90 minutes.
Someone I consider to be an authority on health once said to me, "if you've been sitting still for 2 hours, you're essentially sitting in a puddle of your own filth."
Gotta git up! Git movin'! Even during those super-productive 3-hour work sessions...
Raluca Mesterca