I believe they have 10 days to appeal, according to the FAA's rules...
From Newsweek online article...
"Cheney and Cole have 10 days to appeal the revocations to the NTSB, which acts as an independent authority to investigate and adjudicate appeals of license suspensions by the FAA. The pilots can appeal an adverse verdict by an NTSB administrative law judge to members of the NTSB itself, and then appeal further to the courts. The NTSB has expedited procedures to process an appeal of an emergency license revocation within a matter of days."