Assuming that you're trying to transfer a day's sap at a time, it will take along time to get that amount of sap to gravity through a normal 1/2 or 5/8" hose. If you consider how long a normal garden hose that long would take to fill 100 gallons off your faucet and then think about how much longer it would take with only the standing head pressure of your elevation change, I'd be running 1-1/4 or 1-1/2" plastic tubing for sure. It's all about time but I'd guess that 300' of normal garden hose would take close to 1/2 hour to drain 100 gallon.