10 is a silly number of lessons to gift. That's plain daft. What people need is an opportunity to find out if it's for them. Not even a lesson, as such. There are many people who need a fairy godmother, not in the sense of someone to wave a wand and make them able to play an instrument, but in the sense of someone who can appear in their life and say "actually, if you really want to, you can hold a flute. It's not something reserved only for girls in independent fee-paying schools. Anyone can buy the ones in the music shop window. You too can find a teacher who will show you how to play it, though it will be a gradual learning process taking a long time."
A (real) fairy godmother cannot give the gift of being able to play, but they can give the gift of realisation that the door is not closed. It is up to the recipient to walk through the door, and keep walking... and because you cannot guarantee they will like what they find when they go through the door, the right number of sessions to gift is One.
And not every teacher is going to want to offer this. It's different to teaching.