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).