A kérdést még egyszer gondosan elolvasva azt gondolom, hogy a "kiesés időtartama" a Denny által javasolt "duration of break", maga a kérdéses "kiesés" angolul "break" (in service). Amennyiben a magyar jogszabályokban inkább előforduló "szünetelés" értelemben használt ez a "kiesés", tehát a jogviszony megszakadása rövidebb időszakra. Persze az eredeti kérdőíven nem tudunk javítani, de legalább a fordítása szakszerűbb lesz. :) (Ez semmiképp nem "elimination", azt gyorsan el kell felejteni.)

Példák:

"Generally, substantially continuous creditable service must not include any break in service of more than 30 calendar days. If an employee does not complete the 3-year period, a single break in service of more than 30 calendar days will require the employee to serve a new 3-year period. (Periods of time in a nonpay status are not breaks in service and do not require the employee to begin a new 3-year period. However, they may extend the service time needed for career tenure.)"
http://ohmygov.com/blogs/general_news/archive/2010/08/18/dea...

"a period of leave of absence without pay longer than 60 consecutive calendar days does not constitute a break in service and will not be included in the calculation of the cumulative working period for appointment to indeterminate status under this policy..."
http://www.tbs-sct.gc.ca/pol/doc-eng.aspx?id=12584§ion=t...

"Break In Service
The amount of time someone is not on an agency payroll (i.e., the time between separation and reemployment). For career-conditional employees, a break in service means not being on an agency payroll for more than thirty calendar days."
http://www.hhs.gov/careers/jobs/keyterms/index.html