It depends on why you want to flush - if you're in pain,or if it's because
you didn't see any stones.
If you're in pain ,there have been others on this forum who flushed very soon after their initial flush,hoping to dislodge the stone or debris blocking the duct
As far as I'm concerned every flush I did was "successful", stones or no stones,and I've done three flushes where I didn't have any.
As long as something moves,good.
Maybe next time you'll hit the jackpot
Waiting 2 or 3 weeks is preferable between flushes,so that your liver gets a rest,
it has to do a lot of work on flush night.