If it exceeds your expectation right now, then it should last 8 years with a battery replacement when the battery health goes bad. Because in my experience pixels never get worse than they were on day 1 over the years (except for the battery health).

If it's below your expectation, you are going to want to sell it in 1 or 2 years looking for that thing you are lacking at the moment.

I'm just waiting for the 8A for Graphene support

I had a Moto G4 plus until two years ago. It lasted me 6 years, stuck at Android 8. It worked slow but it was functional. Replaced battery only once. If you take care of your device it can last even longer. I would probably still have the phone if it wasn't that it was becoming too slow and a hassle to do even simple tasks

Since those earbuds are not repair friendly (I love you, buds+) the battery will be the first to go in about 1-2 years depending on use and with minimal care (cleaning and whatnot). The phone software wise very likely maybe even more so depending on third party support. Hardware wise depending on use and care the battery, the screen and maybe the usb c port will need replacement with time. Get a good case, save up like 200-300$ as an emergency fund and about 150$ for a future battery and you should be golden and have fun with the time you have with the earbuds.

Edit: I say the screen since thats the most fragile part of the phone and people tend to drop stuff hence the 200-300$ emergency fund. The usb c port probably might not need replacing (my og pixel xl's still works) but I'm not sure how op will abuse it, again emergence fund. The battery fund is basically a guarantee though since lithium batteries dont last