I know Halo can do four on one gamertag for unranked and I know you can have several individual gamertags on one console, so I'm assuming you can do four for ranked.
At one time? up to 4 in unranked matches in Halo and probably GR, don't know on Gears. However I don't know a limit to XBL accounts on one 360, but then again I don't really know why you'd want more than 1 in most cases.
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