There is obviously a link between the number of applications and the physical size of the skis or snowboard being treated but, taking a pair of 1.70m all-mountain skis or a 1.60m board as examples, you should easily be able to treat them a minimum of 5 times.
Lightly spraying then wiping with a thin cloth can help too – with this method we can even get 10 applications!
The other option is to treat multiple pairs – so apply it to your whole family’s skis a couple of times.