Start checking on queen availability now, but you probably won't know anything for another few days. From the above link.... Queen Cell Development - The earliest you can identify a viable queen cell is when it is already 3 days old - an egg in a queen cup does not necessarily mean it will become a queen cell. The critical decision for the colony is made when the egg hatches out (Day 3) and the nurse bees start to feed the larva with royal jelly. A queen cup with a pool of royal jelly and a tiny larva in it will almost inevitably be taken full term to become a sealed queen cell. Sealing takes place on Day 8, ie. the larval feeding period is just 5 days. Once queen cells are sealed it is difficult to know how old they are without breaking one open to take a look. There are usually cells covering a range of ages present, so you really need to look at several cells in different part of the hive to be sure. Emergence of queen cells occurs on Day 16 , ie. 8 days after Sealing. A newly emerged queen cell usually has a hinged lid attached but it is also quite common for the bees to close the lid and reseal it - look for a line round the tip of the cell (a sort of ‘tear here’ line). You may be surprised to find an occupant in such cells; usually it is a worker bee that has gone in to do a bit of cleaning work and has been sealed in by some tidy-minded sister. If the bee is head-down in the cell it will be a worker but, if it is head-up, it will be a queen and she will just be waiting for you to open the cell for her to walk out. Again, do not panic and kill her! Let her walk off into the colony because this is an extremely easy (even advantageous) situation to resolve (see Step 7 below).