I've set recruitment turns per unit to 1 for everything (inc. Wardogs, Praetorians etc) on this mental Brutii campaign of mine where the Julii are being squished by Gaul, but it seems my enemies (namely Greece and now Gaul) are able to amass armies very quickly. Much quicker than I, in fact. I have real difficulty keeping up with them in terms of troop numbers.
Does the AI always have this advantage during campaigns? My campaign is only being played on Medium difficulty.