how many

hi.. is there a limit in how many models i can have in a map ??

yea, you can have like 400+ models (+spawns+lights+other stuff) in your map like dEMolite said, just for XJ remember this:

The biggest filesize which is allowed is 8 MiB. Files which are bigger wont be uploaded.
-> If your map is bigger than 8 MiB please contact one of our map admins via IRC or split your archive via RAR.

so don't include TOO many variations of models in your map, I'd say that 10-15 types of models are already enough :P