I can estimate the amount of time it will take to run a dethatcher across someones lawn Two fairly large areas and a couple little small areas totalling 8850 Sq. Ft. But how much hand labor is involved in picking up the debris from the dethatcher? I have never used a dethatcher before so I just dont know how much is left on the surface. Do you just rake right over the whole area and end up with a pile of thatch? Any help would be appreciated. I am guessing it will take me about 1 hour to dethatch the whole area. SO how much time will it take me to clean everythign up?