In my meditation courses, I talk about how meditating daily for four or five years will help to stabilize happiness. And without fail, someone always gasps at the thought of having to wait five years to be happy.
First of all, I say, it's a gradual build--it's not like there's a day coming where five years from now you're going to wake up happy, whereas in the months before you were miserable.
Second of all, whether you're meditating or not, five years is going to go by anyway. So you may as well begin stabilizing happiness in the process (smile).