I generally end up going five or six days per week. I have a 3-day split routine for weights (Day One = back, biceps; Day Two = lower body; Day Three = chest, triceps, shoulders) which I usually but not always do on consecutive days. Once the 3-day cycle ends, I'll do just cardio for a day and maybe take a day off entirely, then begin the cycle once again. Sometimes, however, for various reasons I won't go to the gym at all for two days in a row.
For instance, here is my most recent schedule:
Monday, 3/31 - Day One
Tuesday, 4/1 - Day Two
Wednesday, 4/2 - Day Three
Thursday, 4/3 - cardio only
Friday, 4/4 - I'm not going to the gym today
Saturday, 4/5 - probably won't be able to go, if I do it'll be cardio only
Sunday, 4/6 - resume weight cycle with Day One.
My weight workouts normally take 45 minutes to an hour. As for cardio, which I do on an elliptical trainer or stationary bike, it's always 30 minutes.
"Let me think about it" = the coward's way of saying "no"