good post by keith, i will add, don't expect honey capn with a walkaway.....
more approximate numbers to mull over:
a queen's timeline:
day 1, 2, 3, Egg
cell is capped on the 8th day
day 16 Queen birth
day 20 Mating flight
day 23-30 Start Egg Laying
stages of growth of honey bees days after eggs are laid:
egg hatching>worker 3, queen 3, drone 3
larva>worker 5, queen 5, drone 7
cell capped> worker 8, queen 8, drone 10
pupa>worker 13, queen 8, drone 14
adult emergence>worker 21, queen 16, drone 24
queen raised from brood~ about 49 days , so maybe 6 to 7 week delay when you want a colony to raise their own queen. one aspect of this is good mite control, the cons sometimes outweigh walkaways. weather, enough drones, queen turns out to be a dud, and most of all, this is very costly in terms of buildup. bees will dying off and there will be no replacements, so population diminishes greatly. foraging goes down for pollen and nectar, so they will have to be fed.
the queen is raised from young larvae (hopefully), add about 13 days for emergence, add another 15 or 16 days for her to mature......mating, egg laying. then wait for the first bees (workers ~ 21 days) to emerge. your looking at approximately 49 -50 days.
ps in short, i would purchase mated queens, it is nice though to experiment with the walkaways/queen cells/swarm cells for a learning experience.