What is the maximum length allowed for a text box (like comments)?

What is the maximum length allowed for a text box (like comments)?
We may need 50,000 characters or more.
Sent from my iPhone

The Long Text Entry form element has no limit.

If you want to limit the entry, you can change it from the Properties. You should go to the Options tab and change Entry Limits field to "ON" status and set maximum words or letters.

Let us know if you need any further assistance.