try 25 virtual desktops running 2 browsers, one of which with multiple profiles for various broad topics ... my "main" session alone has 75-80 windows at present 😃

edit: installed an extension to find out: in main session, 378 tabs across 84 windows. seems like a low number of tabs per window perhaps, but I organize topics into a window, then related topic-windows into a dedicated browser profile session if they're long-lived, and windows/sessions are grouped into virtual desktop by top-level topic more or less ... so my fediverse/threadiverse session has 35 tabs in 7 windows in only 1 virtual desktop.

edit 2: I theme each browser profile differently to (mostly) tell them apart by eye