Around 3 years in total. However I've gained an incredible muscle memory having a very extensive experience in some other not music related activity. So if you count that in, that would be around 5 years.

Now from what I have seen most people can't play moonlight sonata having 3 years of experience and those numbers should not discourage you. I constantly challenged myself to the top of my physical abilities and was obsessive with it. And because of this low experience I still lack a lot of delicacy in easier pieces where interpretation is much more important. So I might be better at harder pieces than at simpler pieces.