The hole in the tree will start to heal itself when bacteria gets inside, it takes a certain amount of time to heal up and thus stop the flow of sap. Depending on the type of spile you use and sanitation methods handling them and how good a hole you drill all have an effect on how long it will take to heal. The new Check valve spouts are supposed to prevent a backflow of sap going back into the tree, reducing the bacteria introduced to the hole. If you are using regular metal spiles and plastic spouts then you will find they don't produce as long. Clean and sanitise them well. I would ask your friend when they plan on tapping, it is regional and I don't know your climate.
2019- RO
2018- 25 taps made 8 gal syrup.
2017- 25 taps -built a 2x3 flat pan, and a fuel tank arch for it. 335 gal 7.34gal syrup.
2016- 15 taps, 4.3gal syrup boiling on cinderblock arch 3 roasting pans, 1 redneck trash can with a pot, and a turkey fryer.
2015- 4 taps 44 gals of sap made 2.25 gal of lite syrup.