About 2 years for me. It's a better experience than vanilla Android except that tap to pay doesnt work.

Other than that one downside it's been nothing but an improvement. so much more control over what apps can access, and what Google services to use (if any). Google services are treated like any other app, and can therefore be easily sandboxed.

If you have a compatible device i highly recommend GrapheneOS. I'm pretty unhappy with the build quality and camera on my Pixel (7 Pro), but that was all the same on Android.

I really wish GrapheneOS supported another brand of device. Pixels are way overpriced for how cheaply put together they are, but i'd rather have a meh phone with real security than a nice one with just security theater

It works great with Linux for me, i expect Debian will have no issues