When did they come back? (25F) (30M)

I know not everyone comes back or returns to the relationship after it is done, but for those of you who are either the dumper or the dumpee, when did you or your partner end up going back?

I’m just asking for a rough timeline or estimate, how long is enough time apart before reaching back out, or when did it hit you that you regret leaving the relationship and want it back?

Im aware not every relationship is meant to be. But if things ended in a way where there was still hope, im wondering how long I should wait until reaching back out, or im wondering how long it may take my partner to reach out? I know it may seem desperate, but honestly I just love this human and would love a chance to try again.

tl;dr : When should I reach back out to my ex? How long should I wait?