Your lawyer negotiates with the committee’s lawyer. Typically you only get prosecuted for contempt if it is completely flagrant. With Bondi, she may prosecute for simply giving the wrong answers.The concurrence in Eastland seems to think there's some room. There has to be some room: if a subcommittee issued 100,000 subpoenas, surely the court would wonder if there is a legitimate legislative purpose.
I know they are more open-ended than judicial subpoenas, and maybe the answer is that none of the people on that subpoena list could quash.