How long away from gym post-surgery?

For Lap Band does anyone know how long I need to stay away from the gym after surgery?
I am so used to going now, I feel dependent on it. I am afraid not to go. If you know what I mean.
I don't want my body to start to turn to back... yuck.

I started going back to the gym on week 3, just cardio, no weights.  I started just walking for about 20 minutes, and then added every couple of days.  But I started walking at home the first day I was home.  I walked around the inside of my house, up the stairs, then walked around the outside, then around the yard (I have two acres), then down the street and back.  I started doing weights about 8 weeks out, but I had a hiatal hernia repaired also.  I guess it all depends on how you feel.  If it hurts, stop.