I have responded to jury summons many times. Once I tell them I am an engineering by training dismissal is swift. That said I would do about anything short of perjury to not get on this Waco GJ circus.
I have never been summoned for Grand Jury. Perhaps someone will chime in with how that selection process works.
The fact that Renya asked for a 60 day extension tells me that he knows he has a lot of work to do, starting from scratch. And looking at that 6/30 list as an indication of regular criminal activity, he will have a bunch of actual criminal cases to deal with that happened after 5/17.