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Depends on what size you get the larger ones are older - and take less time -
They sell calci worms around here at pet stores which are the same bug but sit around in the pet stores for longer so they hatch out into flies a lot quicker
If you don't want them to hatch you keep them at a lower temp so temp is also probably a factor - I've never actually tried to hatch them - with the medium they took a couple of weeks to hatch out keeping them at about 65-70.
House flies and blue bottle flies can be purchased at mantidpets.com.