Is there a limit to the length of a variable?

I've just come across one that is 176 characters long!
What they have been using is the "question sentence" in a form, and use that as 
the variable name to pass it.
I'm wondering that if a question asked that is even longer will cause an error.

It's not part of what I'm editing (as I'm just doing the html) but thought I 
should warn them about it.



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