A decent sized maple tree can produce a couple gallons of sap everyday. With 20-30 trees, you could imagine that is quite a haul. But a great deal is needed to actually boil it down into maple syrup. The general rule of thumb is 40 gallons of sap for every 1 gallon of syrup. Just watching Lynn out by herself checking on a few buckets of collected sap gives a pretty good idea of just how much manpower is required for the overall process.