How Long Does the Dualshock 4 Last in terms of Service Life?

Hello, people of ps4 subreddit!

Based on your experience, how long do your respective Dualshock 4 controllers last before you replace them with a new one? I was thinking of buying some sort of a spare controller in the near future.

This might help or not, but I recently owned a PS4 last June.

Thanks for your time!