Because it’s a setup.
Yep, they needed the 18 days to produce a lawyerly document that everyone spotted as a such the day it was released.
Now, with #2, they are using the ‘protect his identity’ as an excuse to take a long time to coach him on the proper wording of his ‘testimony’ that REPUBLICANS ON THE COMMITTEE ARE NOT ALLOWED TO HEAR NOR EVEN QUESTION THE WITNESS, FOR FEAR OF ‘LEAKING’!..................................