Google Data API: what is the limit of Extended Properties?

Question

Is there any limit on number of properties and value length in Extended Properties of Google Data API (in particular Calendar API)?

Answer 1

You can add extended properties (arbitrary name-value pairs) to Calendar events. These can be used to store application-specific IDs or other small amounts of information your application needs when interacting with a Google Calendar. The name of a property can contain up to 47 characters, and the value can contain up to 1024 characters. Extended properties are only accessible through the API – they do not appear in the Calendar user interface.