Limit on the text field in the item type metadata

Is there a limit to the amount of text that can be stored in the text field in the item type metadata? I'm trying to add a fair bit of text to that field, but Omeka won't save the text. I've been able to add text to the same field in other items.

If there is a limit to the amount of text, does anyone have recommendations for storing more than that amount? For example, should I include multiple text fields for that item?

All of those fields (Item Type, Dublin Core, etc.) are sized as MEDIUMTEXT in the database. This means that you can store a maximum of 16777215 characters in any given field. If you have more than that, you'll need to add more fields and split the text accordingly.