As long as they aren't attacking eachother I'd give them up to 4 days. Its not possible that she released her eggs and they ate them is it? If not you should be fine to leave them.
If she looks a lot thinner then they may have already spawned and ate the eggs so you'll need to re-condition obviously
Good luck RD, this spawning lark is never uncomplicated
had to pull the female as nothing was happening, she is now in a recovery tank getting better i'm going to clean the tank out and start again with another pair
I tried for 6 months with lots of different combinations of pairs till I started getting my bettas to spawn after my accidental one. Good luck with your next attempt