We do a 1 month/farmer says remove them type of deal with our pollination. If there's an alfalfa field nearby that happens to be blooming right when the melons start flowering I urge the farmer to cut the alfalfa a few days after the hives have been placed and the bees will go nuts on the melons. I must admit I get 1 - 2 supers of honey/hive while pollinating melons, it comes mostly from alfalfa. I've had guys want 1 hive/acre and not the usual 1/2 hive per acre, but 3 hives/acre? I would recommend 1/2 - 1 hive/acre for this area (all water melons are for seed production) and if the farmer still wanted 3 hives/acre I would jump on it.I've never found watermelons , or any melons , to produce honey. Mostly pollen. I pollinate melons every year. Why does he want them on so long? Ours come off in a month or less every year. We get our honey from the surrounding alfalfa and cotton. It sounds like he is new at this too.