Some will lock for only a few hours and some will stay locked up off and on for several days maybe separating for short periods between lock ups.
You will catch them locked up if you check on them periodically.
I walk my male around the house for a few and give him a good pep talk, kind of like the coach before putting in his best player, not sure it works but it can't hurt
*oh and I remove water bowls before adding the male*