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From the standpoint of the person filling out the form, I too recommend not setting any limit on how much information the user is allowed to send.

Unfortunately this isn't actually a realistic goal. What happens when a user submits the form with 100k lines of text? Simply put, you don't want users to abuse the feedback form, as it could be detrimental to the user experience of future visitors. Other users wont care why the page is taking >2s to load the GB of data that some jerk posted, they'll simply go elsewhere.

As an alternative, set the character cap high, but not abusively so. Anything upwards of 10,000 characters seems reasonable to me, but it's a judgement call you'll have to make.

Don't tell the user how many chars they have. They don't need to know unless they exceed the limit. If a user decides to post a massive amount of information that does exceed the limit, alert them with a message to contact you in a different method:

Wow, that's a lot of feedback! To make sure that we appropriately address all of your concerns, you should send us an email at support@example.com. We'll be glad to hear from you.

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