No limit to the length of a channel name
A. Related to no chat message limits - there is currently no limit to the length of a channel name. That's Latin text in scriptio continua, "NEQVEPORROQVISQVAMESTQVIDOLOREMIPSVMQVIADOLORSITAMETCONSECTETVRADIPISCIVELIT" repeated several times. (Good luck trying to write that one to type in it though :p)
B. Perhaps a separate issue, there also doesn't seem to be a limit on the amount of channels you can create.