[Zope] lines property size

Hello, I'm storing a list of people filling a form in my Zope site in a folder property of type "lines". Now the number of lines has started to increase a lot... I know this is not the best choice, but I didn't expect the users to be so responsive at the time. Is there any limit to the size (= number of lines) of such property ? (just to be relaxed while developing a better way to store it, e.g. a TinyTable...) Thanks Mik