Geez, apparently this site has a limit on how often I can post. Made my IC post, came over to OOC and had to wait three minutes. Then I went and posted my character and had to wait three more. @_@
Most of us are actually more used to chat RP, actually. This is my first time RPing in a forum. Though I thoroughly enjoy writing, so this isn't too different. Anyways, I wouldn't be too worried about your post length, just make sure there's enough information going on.
@BlackFlagI wouldn't worry about it, no. Just so long as you've got your reaction/reply to whatever's going on at the moment, you can be as simple or as intricate as you'd like.