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My mini ramp boards last years - that is just skating my own mini ramp only on those boards.
My usual skatepark boards, a few months depending on the surfaces, eg rougher park surface, tail wears down faster, smoother park surface, tail lasts longer.
Trying to still skate street or skate like I used to, boards can last not too long, especially if I am lazy or land wrong. Boards don't break, but I have sogged out tails / noses very easily on some boards, to the point it is just better to take them off and set up a new deck.
Some boards I really enjoy and I just don't want to take them off, whereas others I can't wait to get rid of, especially if they feel too steep across the board or something happens on it that makes me just think it is better to pass it on to someone else ASAP.
I tend to go through phases of setting up a few boards at a time, then don't set up any for a while, then set up a few more, so it is never a set time that they last and I have too many on the go all at once too, which sometimes can be a bit weird, but other times, it is good as I have boards with different size / shape / duro wheels for different things too.
Nothing is ever seeming so simple or easy for me, but I like it that way.