Your question is an imponderable - I don't think there can be a "usual" in computer use. Everyone uses the hardware in different ways. One measure, for what it is worth, is that in business it is, or at least was, common for computers to be replaced every three years. Having said that, this was more often that not for bargain basement Windows computers for which you wouldn't expect a great deal anyway.
I can tell you this - I've used my ageing iMac every day for six years often for intensive A/V work and it's still doing well, although my plan is that it will be replaced with the next released iMac.
You can look forward to a long-term use of your Mac; they are built to last. The investment you made getting it will reward you with many years of use. I have a number of older MacBook Pros - one 12 years old - which family members have retired when they bought new Macs and all of them are still performing well, apart from not being able to run anything beyond High Sierra, the 2017 release of macOS.
Just keep your Mac up to date, power cycle the battery regularly, and enjoy using it. At some point you will find that it is beginning to cope less well with new games and software of the day. That is the time to activate your hardware upgrade path to a new Mac, but that day is some way off yet.