I haven't used miticides at all, but if I recall the data correctly you can use the honey as long as it was deposited after the miticide was removed from the colony. The miticide will build up on/in the comb and it's possible that it could contaminate the honey in small amounts.
Since I'm trying to develop mite resistant bees all I do is an occassional sugar shake and let them fend for themselves. I truly believe that relying on miticides is doing more harm than good. It might be cheaper, in the short haul, to use miticides but the future of bees, themselves, is going to be mite resistance.