When using the Read API for the the Custom Object API:Is there a query Body length limit? I reached about 60 fields in my select, plus have a WHERE and ORDER BY clause and fields that return in a shorter query work fine, but when added to the longer query with 60+ fields the queries suddenly fail. When reading from the Activity Timeline object I am not able to read the Notes or the NotesPlainText fields. Is it possible to return a Rich Area Text field such as Notes using the API? Why would the NotesPlainText field, which is a String fail to return? Is there a String length limit for the read API calls?

Question

Custom Object API questions

When using the Read API for the the Custom Object API:

Is there a query Body length limit? I reached about 60 fields in my select, plus have a WHERE and ORDER BY clause and fields that return in a shorter query work fine, but when added to the longer query with 60+ fields the queries suddenly fail.
When reading from the Activity Timeline object I am not able to read the Notes or the NotesPlainText fields. Is it possible to return a Rich Area Text field such as Notes using the API? Why would the NotesPlainText field, which is a String fail to return? Is there a String length limit for the read API calls?