Depends totally on how you feel.
For me it was about 2 weeks out. Could have done it a week earlier but DH thought my sores looked icky and sore, they were icky but not sore....it was probably a good thing I waited....
But I felt pretty normal, well a little better at 2 weeks I had lost 18lbs, and my hubby had been dieting and he'd lost 15lbs!
Now at 6 weeks, I'm down 30lbs, he's down 25lbs....all is good!!!!