Nowadays I play differently to what I did as a kid. I've never really been one to play a game for hours upon hours, but rather just 2-3 hours a day (if it's a new game). Partially because of a lack of time, but also because I don't want to "waste" the new game immediately. I'm the same with series. Some people like to binge watch things, but I don't. I usually only watch 2-3 episodes a week of a series I follow. Sometimes less. This way I get to drag out the experience over a longer period of time.
I remember when Skyward Sword came out, one of my friends beat the game in two weeks, while it took me about 2 months. Only thing I don't like about this way of pacing my playing is when too many games come out at the same time. Like last fall, when there was LA Switch, Spyro: Reignited, Yooka-Laylee and the Impossible Lair, Luigi's Mansion 3 and Pokémon gen 8 within september-november. I got a bit overwhelmed then.
Typically when I play through a game, I'll just play it as much as I can during the day with a limited number of breaks. I've been accustomed to playing through games this way since I was a kid, trying to accomplish as much as I can in one sitting. This became more evident when I began working on my backlog last year and would just blitz through games day after day, trying my best to put in as many hours as I could in a shorter span of time so I could beat them as quick as I could.
I don't really pace my sessions in the duration of sittings, so much as how much I actually get done in a sitting. Especially as I near the endgame, I tend to stall my progress a bit more. I'm still indulging in the game, I'm just not ready for it to end. This sometimes results in me getting distracted before I actually beat it, though, so I have to find a balance.
When the game is really good, it's pretty typical for me to find myself playing 4-6 hour sessions at a time during my first playthrough. And possibly more than one session in a day. The shorter the session, the more likely there will be multiple throughout the day.
I've noticed that my play sessions range around 40 minutes to an hour, maybe a little more or less depending on the game, and I typically go back to it at least one more time later in the day
I generally can't do multiple hours in one sitting, after a certain point I just feel compelled to stop for the time
It depends on the game, the genre, and how much I like it from the get-go. Engaging games with a balanced learning curve have me playing for hours when I've got the time, others may take me a while to learn to like. Some I'll play sporadically.
I'll usually only play once per day, for around 2-3 hours, but potentially more if it's a new game or if I really get into it. In addition to being busy, I usually prefer to slowly savor new games and make them last; I'm not the type of person who can really binge watch something or play for hours on end, even when I really enjoy it.