I use a 10:1 house rule and I think several others herein have come to the same conclusion. For every 10 men, one is represented in the game. Thus, a standard Camillan Era legion would consist of 3 units; roughly one 162 man unit of hastati, one 162 man unit of principes, and one 162 man unit of Triari.
For a consular legion add a 240 man unit of Rorarii. When using several legions in a stack add one general and one 100 man unit of Eqvites. Support troops for two or more legions can include whatever mix of slingers and/or archers and other native troops afoot and/or horse you think will do for the job at hand.
Using this math you can raise six Camillan Era legions within a year (18 units) from your five core cities. You should be able to double this output in the Polybian Era. I normally use two to three of these legions in each stack, but four or five are not out of the question. However, this is just the way I play, and of course, you'll have to find the way it works for.
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