It’s no secret that sailors are busier than ever, especially those who are on sea-duty. Still, the reality of how much time individual sailors spend away from home might surprise you.

Personnel tempo, or PERSTEMPO, measures the number of days each sailor spends away their home port on official Navy business. The moment a sailor leaves a home port, the PERSTEMPO clock starts.

Navy Times obtained the last three years — FY15 to FY17 — of PERSTEMPO data for the entire Navy from Navy Personnel Command. That information was then broken down and sorted into the graphics below, which show the five commands in each category where sailors are away from home the most.

Carrier and destroyer sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Carrier and destroyer sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Cruiser and amphib sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Cruiser and amphib sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Missile submarine sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Missile submarine sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Sailors from the fast attack sub crews who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Sailors from the fast attack sub crews who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Squadron sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Squadron sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Helicopter squadron sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)
Helicopter squadron sailors who spent the most time away from home, according to PERSTEMPO data from FY15 - FY17. (Source: Navy Personnel Command / graphic by Philip Kightlinger)