Micros Systems Restaurant Enterprise 3700 POS Reports Manual page 326

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For example, if a check were begun by table number on UWS 1 at 1:00
p.m., and tendered at UWS 2 at 1:30 p.m., then the table turn time for that
check would be 30 minutes. But if the clock in UWS 2 read 2:30 p.m., one
hour ahead of UWS 1, then the table turn time for that check would be 90
minutes. If the clock in UWS 2 were one hour behind UWS 1 (reading
12:30 when the clock in UWS 1 reads 1:30) then the table turn time would
be negative 30 minutes (printed as 30-).
Table turns longer than four hours are not included in the average table
turn. However, if a table was actually turned in thirty minutes, but the
check was not closed for three hours longer, average table turn time will
not be correct.