How much memory will the Halo 3 downloadable maps take up?

[aeroprodrivemaster]

so, about those new downloadable maps for live that'll be released sometime in the future...does anyone know how much memory they will take up on a hard drive/memory card?i have a 256MB memory card, will that be enough for the maps? ive taken up about 10MB from Halo 3, the only game that i have and the only game ill need.

so, yeah any estimates on how much memory they will take up? any input is appreciated. thanks in advance