I've been playing Runescape since grade school. I'm approaching a bit shy of 25,000 hours played (a little under 3 years). As an AFK'able "second monitor game" a good half of that is just "I'm at my computer anyway" but the other half is actual investment/more active playing.

I don't bother playing a game if I'm not going to invest a significant amount of time into it. I aim for 100% completion or reaching the top 0.1% of players if there is a competitive ranking system. It's extremely rare for me to play a game that I don't dump a minimum of 500 hours into.

My play time is less now than it was when I was a teen but it's still skewed towards the higher end due to me being fortunate enough to work from home with a FIFO queue of work. If my work is done - I can game during work hours if I want to. As long as I keep close tabs on my queue and handle anything as it comes in. This gives me 8~ hours of potential game time that I otherwise wouldn't have. Since I need to be near my computer in case any work comes in - I'm pretty limited with activities I can do. I can lift some weights, browse the internet, cook a quick meal, or play video games. But I can't really leave the house, go swim in the pool, etc.