Hi Rob,
Basically unlimited. As CFS2 is self contained, you can completely copy one install...and paste..and paste...and paste...then rename and set up to what era you want.
The only thing to consider is if you are making/compiling missions (not actually using one), the MB will point to your first/original install, and you will have to change the path manually to get it to use/compile in the other versions. Other than that QB, Missions etc work in each install. You can also make a centralised scenery libarary ,including other folders, and get all the versions to point to that, which cuts down on space (if it's an issue!).
I've got 4 installs, had 6 and just deleted 2, as I didn't need them.
> PTO/CBI
> ETO
> MTO
> EFTO
> WW1
> SCW
> Korean War (plus various other things from 1946 to late 50s)
> Modern era (actually, random things from the 60s to nowadays)
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