God...even 3 times a week wasn't enough for us.
You really needed to practice every night and go through your whole set as if you were playing live.
You need to get not just the songs down pat, but the talking in between the songs and being able to quickly switch from one song to the next.
Plus you have to time your whole night so it fits into the schedule properly.

If we just missed a week, we sounded like crap.