I dont know but Im guessing that fortress is at least 100m per side maybe far bigger.
You mentioned this is your first dip into GMing on FG.
In FG you can prep all your encounters and NOT add them into the CT until they are needed.
By needed - I mean until you need to start shooting.

each of these circles is probably a separate encounter.
when you add an encounter to the CT it ADDs it to the CT - they might be prepped separately but you can easily have reinforcements from an adjacent area be alerted (add them to the CT) and then reveal them.
some other VTTs have everything on the map at the start
in FG you PIN the encounter to the map and you add it to the CT only when the players arrive to that location.



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