3 years, though getting it back then was like asking for heroin. Certainly helped regain some ground, and improved the texture of what I still had.
Hated the foam. Damn near useless, expensive, and a mess. OM turned me into a bit of an ape, but it's easy to handle with an occasional shave.
Really helped my beard too.
Funny thing is, insurance assumes it's prescribed for blood pressure, so they covered it. Even though it's dirt cheap already, it got down to $5 for 180 2.5mg tabs for me.
I wish 5mg was available so I didn't need 2 tablets. India pharma sells 5mg.
Now after 3 months of low dose Fin, improvements have started up again.
I'm even considering switching over to Dut, because it targets the 5-ARs that live in sebaceous glands, right next to follicles, which Fin doesn't.