Do you go back a few days after planting cells to check for emergence or do you make your first check when you are checking for eggs?
I check for emergence, and at the same time try to ensure that each mating nuc still has a supply of honey, pollen, brood, and empty comb.
What do you do when the cell was a dud? That is, if you don't have another cell at the time.
So much to learn, so little time!!
I mark them with a single white thumbtack and try to make sure I give them a frame with eggs, as soon as possible, to help reduce laying worker problems. Right now, I am between queen cell batches and have several mating nucs with white thumb tacks (telling me they are awaiting a cultured queen cell). I am watching them most closely until my next batch of queen cells is ready to place. If they raise their own queen cells from the eggs I give them, I will remove them when I place the cultured cell, but usually only if I sure those cells are older than my cultured cell. I think they help the new cultured virgins have a purpose -- destroy rival queens.
I only make a couple of batches of queens a year, so I check for emergence and then merge any nucs with failed cells with nucs that have hatched queens. In queen castle type setups I just remove the slide. In 5 frame boxes I replace empty comb with bees from the failed nucs.
I make up new mating nucs with the next batch of cells since it will be maybe three weeks until I do my next batch. If I was making a batch a week, I would just add a frame of open brood to a failed nuc and then cut out any queen cells when I put the next cell in.
I just replace the non-emerged cells with new ones. Or, right in the yard, you can graft a couple of cell cups from a nearby strong hive and push the cups into a brood frame. Or give them a frame of open brood/eggs from another strong hive and then requeen when you have cells available if you want specific genetics. I really dislike doing the work to make splits and then having to combine them or letting them dwindle, so I take pains to get them queenright.
So checking queen emergence will not disturb the virgins acceptance? I've raised a few queens I'm just trying to fine tune my schedule and do it better not necessarily faster!
When the virgin emerges in her own mating nuc, I've never seen them later reject her, unless she fails to mate and start laying. They might then, later try to supersede her.
I have seen them reject virgins with some physical defects, especially malformed wings, where they wouldn't be able to fly. At my post-emergence check, I usually take care of any malformed virgins, as soon as I spot them.