I ran a total of 44 mic/tie lines to the Patch Bay that are normaled to the console Mic inputs it i want any of them to be line level i just patch in and it breake the normal to the mic in
They show up in 2 panels in the live room and one in the booth
i say run as many as you can
The way i delt with the booth, is i doubled the last 16 and they show up in the live room as well as the drum room
(this works fine for me as im pretty much the only AE that works here)
As for the control room i thing one or two might be enough