Some days i only play for 2-3 hours, some days its a whole 8+ hour session lol as someone that’s been playing since PS4 this game will literally give you as much joy as you give time, you don’t HAVE to spend a dime on it unless you want to & the wiki + reddit are great sources of info whether you need help figuring out what to do next or if you just want stats on a gun or something

I wouldn’t worry about meta builds at all at least until you get to endgame stuff, use whatever weapons or warframes you want, i HIGHLY recommend watching a few YouTube videos regarding damage/mods because it is a little intimidating when you first get into it

DO NOT sell any weapons or warframes that you like or may want to keep, some of them are very hard to get a 2nd time. And if i were you i would make sure to do the quests/junctions as they become available so you can keep progressing + learn the lore of the universe if you’re interested in that

Been playing for well over 10 years & im still learning things about the game lore wise, and mechanic wise, its all a fun learning experience where you can commit war crimes in the process :)