I use 3.
At home my main computer is a desktop with 3 monitors (aka the bare minimum 😂). In runs a Debian/Windows 10 dual-boot. I use Debian for pretty much everything, mostly coding. Windows is used for gaming purposes only.
I also have a laptop that I use for small tasks... it's mostly when I want something more ergonomic than my smartphone but when it's not worth to boot the desktop. Let's say it's the couch computer!
At work I also have a desktop with 3 monitors, it runs Windows 10 but I work in a Linux VM 99% of the time.
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