In my opinion, I see no reason for a roleplay to tread near the 2500 mark. As Wyatt points out, you can easily just break it into two pieces, with a cut off point/cliff hanger that can actually be far more entertaining.

I have pointed out to a few people who choose to write extremely long pieces that: Knowing when to end a roleplay is as important as the quality of it.

Though not entirely true, what I mean by that is, if you can keep the reader's (IE, management's) attention and interest throughout a long role play then it's not an issue. Just don't do a RaYne and bore half the roster to death half way in and we'll all be better off for it