In the Edit Form » Fields tab » Edit Field dialog, you are presented with the following options:
- Custom Display Format: this determines how your time field looks when displayed when editing and viewing. Unlike the date field, if you change this value after there are already entries in the fields, the old data will not be automatically converted to the new format.
- Field Comments: this field is common to all field types. It lets you add some comments underneath the field to better explain what it's about.