How long to wait between endoscopy and tummy tuck?

There is no fixed waiting time I would request you to wait till you feel better and comfortable to undergo a second procedure which is much more extensive then an endoscopy. A week or two may be good enough.

I am assuming you are undergoing the endoscopy first.  Waiting 10 to 14 days should be sufficient.  But, you are undergoing a tummy tuck under IV sedation?  It must not be a complete tummy tuck.

I would suggest waiting at least a week or two to allow your body to equilibrate after undergoing a bowel prep and fluid shifts that go with that.  That would also give time for any biopsy results to come back.I would consult with a board certified plastic surgeon first to schedule these tests and surgeries.