Yes, there are character limits for Fill in the Blanks and Open-Ended questions.
The Fill in the Blank question type allows your students to enter their answers either in a single input field (with a character limit of 999) or in separate boxes per letter (with a character limit of 40).
To learn more, refer to our article on the Fill in the Blank Question Type.
Meanwhile, Open-Ended questions tend to have longer answers. Accordingly, the character limit for these answers is 1000. A character count is displayed to students when their answers begin to exceed 900 characters.