Dana -
Unless something doesn't go according to plan during surgery or in recovery, I don't think he will be in ICU. Usually a week to 10 days is a typical stay for most people, your Dr. will be the decision maker on this one.
As far as drain tubes, my last one came out a month after surgery (new suture thread, didn't disinegrate as fast as they thought). Still, I did walk around the house and go for short car rides.
The hospital will probably have him walking the day after surgery, like Mike said, even walking in place next to the bed. Movement is important, it wakes the body up and gets organs and systems moving after being messed with.
The Men and bladder cancer section will have more stories and info. on the neo-bladder. Any little wrinkle that can happen, I think one of the guys has been thru it and lived to tell the tale.
Lynda