I flowerd a few weeks ago to show sex then switched back to veg so sex was already showing
The switch back and forth can kind of mess them up, but they eventually straighten out. I did it accidently once and they went through some weird growth forms before returning to normal.
Otherwise, like RIKNSTEIN said at least a week, commonly 2 weeks, even longer.
Since you tricked them once they may not trust you and be hesitant to flower. Just Kidding.