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based on an earlier version of the Wolfram Language.
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SessionTime

SessionTime[]
gives the total number of seconds of real time that have elapsed since the beginning of your Mathematica session.
  • SessionTime starts counting time as soon as your operating system considers your Mathematica process to be executing.
The number of seconds since this kernel session started:
Get cumulative wall-clock timings during a computation:
The intervals between timings:
The number of seconds since this kernel session started:
In[1]:=
Click for copyable input
Out[1]=
 
Get cumulative wall-clock timings during a computation:
In[1]:=
Click for copyable input
Out[1]=
The intervals between timings:
In[2]:=
Click for copyable input
Out[2]=
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