Is there maximum length of input to an InputBox?

I'm wondering if there is a limit to the number of characters (byte length or character count - either Len() or LenB() ), that can be typed or pasted INTO an InputBox.

Sorry if this is extremely fundamental, but all of the research I've done on this (including MSDN) has only led me to the max length of the PROMPT (1024), which isn't what I want.

I want the length of the actual input, if any.