My missus taps 580 trees, 8-9 years old, 1/3rd diameter in 2 hours 15 minutes. Her brother and his wife as a team tap 1,890 big 9 year old trees in 5-6 hours, and they are good, but on the limit. Also once finished, 1,890 trees will need their formic acid adding to coagulate, taking another 3 hours for two people. It takes me 2 hours to formic the 580 trees my missus cuts... but then i'm a felang. Sheet is different again.