At that concentration, I wouldn't stand in the yard myself. At one cup to 5 gal. water, I would think it safe.
If only a few hives were involved, I would think about leaning 2 sheets of plywood over each hive to make a tent like covering over them. Once the spray has fallen, there should be no problem. I would also mow any blooming clover , etc. and cover any blooming flowers or shrubs until the spray had settled.