Best I can tell, your size limited is due to the maximum size of a character as defined in help "1 byte per character to 254".

And as far is if it is supposed to work that way, yes, that is the proper usage of a semi-colon. All that does is tell Foxpro that your code continues on the next line. I once ran into a problem where the last line in a comment block ended in a semi-colon, and my next line of code (which didn't have the comment syntax coloring) didn't execute because the semi-colon technically meant that it was a continuation of the comment!

Hope that is clear to you.