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The wall clock time.
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The user cpu time and system cpu time are pretty much as you said the amount of time spent in user code and the amount of time spent in kernel code.
Wall clock time is the time that a clock on the wall or a stopwatch in hand would measure as having elapsed between the start of the process and now.
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Elapsed real time real time wall clock time or wall time is the actual time taken from the start of a computer program to the end.
The units are seconds and subseconds which might be microseconds or nanoseconds.
The reference to a wall clock is how the term originally got its name wall time differs from time as measured by counting microprocessor clock pulses or cycles.
In other words it is the difference between the time at which a task finishes and the time at which the task started.
Wall time is thus different from cpu time which measures only the time during which the processor is actively working on a certain task.
The number of microprocessor clock cycle s per second of wall time depends on the microprocessor s clock speed.