If you feel too lazy to open the terminal, I've made a simple GTK python script that can show you your uptime and your uptime only. It's compatible with the Unix philosophy, at least in the sense that it does one thing and one thing only :)
If you're on Arch, you can download the prebuilt pkg.tar.zst from here and install with pacman -U:
Dependencies: PyGObject (python-gobject in Arch)
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