Get star fox. It can definitely last you a very long time. It has a decent enough multiplayer mode, and single player lasts forever. With the whole medal system and trying to be able to play expert mode, star fox64 can take up a lot of your time. Only con is slippy's annoying voice.
I Beat the Paper Mario. it's good if you like action. and there is no annoying voice. but there is a lot of reading and if you dont like RPg's it's not for you. but i have tryed the star fox one and it makes no sence to me because i dont like space games
Open spoyler if you want to know how long it took me to beat paper mario 64