One of the "basics" that needs learning.
Knowing the life cycles is one of the "basics" that I think should be learnt at a very early stage in beekeeping. Sadly this is often not the case and I once did a whole day's teaching session, where a couple who had kept bees for over 20 years didn't know any of them! This might sound incredible, but similar stories are quite common. I have written a suggested learning list for Wisborough Green BKA where I have suggested that knowing the life cycles should be done by your 4th hive inspection. I really don't think that is unreasonable as the knowledge is needed in order to manage bees efficiently.
When teaching I like to give the timings from the time the egg is laid, not the time in individual stages. This I think avoids confusion. The timings given in the table below are reasonably accurate, but we are dealing with natural things and they will vary. In recent years I have observed queens in particular can regularly be 3-4 days overdue for emergence. If you remove a queen from a colony there is sometimes still a reasonable amount of worker brood that hasn't emerged after 23 days.
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It is my view that beekeeping teachers should teach the life cycles to beginners and why they need to learn them. The most important ones are the dates the cell is sealed for the queen and when she emerges, as this is needed when dealing with swarming and it's control.