its all relative to what you are comfy with. My boat takes on about 1.5 decent size sponge fulls over 2-3 hours. Probably not a big deal but since I always am looking for projects on the boat that will be the next one. The problem is the leak is always in the hardest place to fix- like the daggerboard wells. I honestly don't know where mine is leaking but I will check the board wells first then the transoms (I added some glass to reinforce and maybe I didn't seal them well enough) then the beam bolts on the main beam then the ports which I seem to always lose the little rubber orings for