Mine should be Monster Hunter with roughly 2-3 k hours across the series. But single-game most played hours should be Final Fantasy XIV with a little more than 1.5k hours.
To be honest: Im not proud of any of this. Most of the time was accumulated when I was much younger and I wish I would’ve had the courage to engage in meaningful encounters with other people instead. Gaming used to be my main escape mechanism, which helped me get through some rough times, but held my personal progress behind by a good margin. A little playing on the side won’t hurt though, nowadays.