Too many factors to know how long, it depends on location, time of year, depth, near deep water or not, near a channel or not, I have stake beds I can see sticking out of the right now, they only produce a certain time of year under certain conditions. I have some in deep channel bends which probably have fish on them now? Some are at the mouths of the bay and will be good for pre-spawn, like everything else, location, location, location.