On average -I work on about 20 mins.
However, it all depends on the conditions and what the bait is you\'re using. The same spot can be completely different the next day - even the next tide.
Sometimes you could put a big cocktail bait out and within 10 mins it\'s either totally washed out or half eaten by crabs - other times, you could put the same sized bait out and leave it for 45 mins - when it\'s reeled back in, it looks as good as it did when 1st cast out.
As Jim mentioned, it\'s a good idea to leave your 1st cast out for only a short time (about 10 mins) this will give you an idea of how your bait is fairing in the present conditions.
[Edited on 12/10/2005 by TC]