As Dave pointed out timing is everything in Bee keeping. Queens take around 15 day from the egg getting laid to hatching. My day one was 29 March when I split the winter survivor hive; moving the existing queen with the split. No problem there, that split should have been go to go. No worries, there.
The survivor hive would make their new queen from an egg 3 days or younger. All bees receive the same food, royal jelly, until day 3. If that protein rich diet continues past day 3 that larva will be come a queen.
April 5th I went into the survivor hive to search for queen cells. I found somewhere around 15 in various stages of development, but most importantly I found several of them had been capped and were continuing to develop as queens.
I could expect a queen to hatch in about 7 days or around the 13th or 14th of Apr.
Discovering this didn't take too long so I decided to look in the split and see if that queen was laying eggs. She wasn't.
In fact, I couldn't find her or any sign she ever existed. That hive was in a death spiral and had no resources to break it.
Fortunately, I had a large number of queen cells and nurse bees in the survivor hive. My problem was that the queen cells were in a square box hive and my split was in a rectangler long box hive. The removable frames are not interchangeable.
The solution to that is quite easy, actually. I cut "plugs" of comb with the queen cells out of the donor frames and re-planted them in the split. I was careful not to come too close to the queen cells as I cut them out. I put more nurse bees and 3 capped queen cells in the split. They will hatch about the same time as the queen cells in the survivor hive.
So everything is good to go, right. Maybe, maybe not. The first thing the newly hatched queen will do is find the remaining queen cells and kill them by stinging them. Then the queen will wait 4 or 5 days to harden her shell before she leaves the hive on her maiden flight. She may have to make 3 or 4 flights to insure she collects enough sperm for a lifetime of laying eggs or she may became some bird's lunch.
If that happens, I'll have to start all over with 3 day young eggs. I'll have to find some of those in a friend's hive. That's the plan but remember I need each hive to have a large number of nurse bees, too, to tend the new brood and those girls have been becoming honey makers with a life span of 6 weeks in the summer. They've been dying all along.
And that's why honey is so expensive