wall time

n. (also `wall clock time') 1. `Real world' time (what the clock on the wall shows), as opposed to the system clock's idea of time. 2. The real running time of a program, as opposed to the number of clocks required to execute it (on a timesharing system these will differ, as no one program gets all the clocks, and on multiprocessor systems with good thread support one may get more processor clocks than real-time clocks).