If you're not against supporting Apple, their laptops always seem to have the most longevity. I am still running my M1 with 8G of RAM and it out performs the latest "top of the line" Windows laptops my work are handing out.
Prior to this one I had a MacBook Pro for about 7 years and before that one the black plastic MacBooks from 2007.
So three laptops for the better part of 20 years.
My first generation M1 Macbook Pro has been a great workhorse as well. It is still chugging along. The backlight on the keyboard is a distant memory. One of the two USB-C ports decided to retire its data bus. It also made a high voltage arc and rebooted earlier today for the first time ever. I was very pleasantly surprised when I found out the speakers were spared any damage during this process.
It came back online right away as if nothing happened and has outstanding battery life that's still making the M1 Max envious.
We use multiple M1 airs as dev machines and they're all still working perfectly fine and very fast, nothing has broken, on top of that they were all bought used. We're not looking to replace them any time soon. Not an Apple fanatic personally (don't own a single iProduct), but the M series of laptops is extremely well built and performant. I expect them to last at least 6 years from time of purchase.