I was reading about the validity of the written test, 1 d. Applicants must be currently employed by a 14 CFR part 121 or a 14 CFR
part 135 air carrier. However, applicants do not need to have been
continuously employed by a qualified air carrier between the time they passed
the knowledge test and the time they apply to take the oral and flight tests.

Any idea of how long of a gap in "continuous" is?