Is there a character limit on thread posts?

[Velvet Elvis]

Is there a character or word limit on thread posts?  I ask because sometimes I see people posting their op's as several parts- usually when they're longer.  

I just wrote a post that was a little on the long side and when I went to preview it it was just black.  Maybe that's a glitch?

[OneStepBack]

I asked TSK the same question a few weeks ago.  There is no limit so you can post in one submission.