sharepoint item comment size?

Hi folks. I'm using an http-to-sharepoint to add comments to items:

POST _api/web/lists/getbytitle('<List>')/items('⁠⁠<item>')/Comments

body: {
"text": "<automated comment>" 
}

Some comments are getting rejected with a "comment too long". What's the max length of a comment for a sharepoint item? Is there any way to change it? Does the UI have the same limit?