Hi rb
Lot depends on the plants themselves. Some can get by on little watering, others need more. Hanging baskets are notorious for drying out quickly. Are you able to soak the baskets - immerse in water - so as to let out any air pockets that can occur when drying out takes place?
Deadhead any flowers that have gone completely - it gives the plant less to concentrate on for its survival.
Might take a while for them to recover, due to dehydration, but you should soon see a difference if it is not too late.
Copious amounts of water if you are unable to immerse them.
Good luck greenfingers!!