Ok, let's do an average here. Blockland was green-lit and released on Steam December of 2013, which was almost 8 years ago (loving yikes).
So for me that's roughly 425.3 hours on average a year since then.
I started playing retail in June of 2007, I'm not going to count the on and off sessions I played in vanilla or the pirated borrowed copy I had before buying (sorry Badspot), which puts me at 14 years of total play (loving yikes).
That means on average I've played 5,954.2 hours, or roughly 248 days- which is still shy about 3 months. Now this number is probably skewed too low as when I was in my teen years and had no responsibilities outside schoolwork I would play hours at a time after school, sometimes every night. When we were making Block Wars in 2009 I probably was on Blockland everyday that summer.