I started playing video games in arcades, which means it had the gameplay style of "survive as long as you can not to waste your money" which made me a type of gamer who quickly learns rules of the game to play long as much as I can. This way of gaming always stayed for me.
Then we bought Atari 2600, my sense of survival now turned into "not wasting money on the electricity bill" especially because economy was shit so I had to find a job when I was 12 to pay the bills while my mother paid for the rent and rest of stuff and I really had limited time to make the only TV in the house used by me to play games. So I kinda got used to rushing playing games to finish them in one sitting. Back then games were short so they were good for "enjoy the full game in one sitting" and "good for replayability". It wasn't dragged with cutscene and chore BS. A game was always about a game, not Netflix or new generation kid insanity that is not even about how a game is. So this sense of gaming evolved and still lingers for me.
Then I played NES and Sega Genesis games that changed things a lot. NES games were too easy and kinda boring, there was nothing new for me. I was almost stopped playing games altogether or return to arcade days but didn't waste money on it but honestly Sega Genesis came to my rescue.
Sega Genesis games could be finished in one sitting so it's what I still did. Games could be finished in 8 hours max or something. Not having a way to save the game but some games had password system that was a drag to write it down and enter it to the game I preferred to finish games in one sitting.
Then played PS1 but things slightly changed. I disliked that some games couldn't be finished in one sitting. They were too long. You could save the game but it didn't matter to me. I ended up playing games until I get bored without finishing them and never to play them again. PS1 changed my gamer habits into "this game is so rubbish I wouldn't bother playing them anymore" so I started a tradition of when a game is shit I would throw their disc out of my balcony and watch them fade away in the horizon lolol. Back then when a game was shit at least you would play them to the end that didn't take much time, but making games shit and longer changed things a lot for me so instead of bothering to play them I would trash them. PS1 area was also when games losed their fundamental nature of replayability, they became more about BS stories and cutscenes that who cares dude, this shit ain't a game. However some games made me spend tons of hours in a day and I was glad I can save the game like Racing Lagoon. I played this game a lot, sometimes 20+ a day lol. But nature of longer games made me kinda develop a way to "speed playing" that for usual players it may take 30 hours to finish Breath of Fire 4 I made it possible to finish it in a day.
Then played PS2 games, my "finish a game in a day" mentality was in its worst states, I was grinding for 20 hours gameplay time a day further. GTA San Andreas fucked up my sleep cycle lol. Without being aware I became speed runner naturally but it wasn't like I skipped anything, I was just doing anything fast and without any slight delay. It actually affected how I live in my life too. Too much dialogues to read, so I read fast and skimmed to the end of the dialogues. I started to skip cutscenes when I can and all. I even started to read books sonic fast!!! I was moving so fast to others I seemed like lightning fast!!!! lolol
Afterwards I became too busy to play games. When I could I would play games on my phone and then GBA and then PSP and 3DS but it was more like 10-20 minutes of gaming, but when I was free around 6 hours gaming.
For a decade my gameplay habits significantly changed. It's 10 minutes gaming sometimes in a day and when I'm free it's 1 hour to 2 hours. I still have the mentality to finish a game in a day by pushing it to 20+ gaming but I'm too busy for that anymore. Perhaps after I'm retired I can play games for 20+ in a retirement home lolol.