It just depends on what you have. Shotguns might take awhile, nice hunting rifles might take awhile. Pistols in .40 might also take awhile.
Do you really want to be bumping ads for the next few months? I like to price things in the mid range and take offers, don't be thinned skin if someone low balls you, they are just trying to do the best for them and you are trying to do the best for you, no hard feelings.