I'm sort of between games at the moment, but Savage Worlds has quickly become my favorite system to run. Between the hard-and-fast playstyle and ability to adapt it into pretty much any setting you can think of, I just think of endless ideas for games.
I feel the same about PvP in games in general. I just wanna vibe, maybe hang out with friends, and the sweat that comes from going against other people actively detracts from that.
I've always considered "one shot" to be "one story arc" like a dungeon or something rather than strictly one session, so I thought it was normal for them to take a few sessions, especially if you don't have time to play for 6+ hours straight.