HEIDENHAIN ITNC 530 - CONVERSATIONAL PROGRAMMING User Manual page 421

The TNC records the total machining time for all teach-in
cuts (LTIME), all control cuts (CTIME) and the total time
difference (TDIFF), and enters it after the keyword TOTAL
in the last line of the log file.
The TNC can only calculate the time difference (TDIFF) if
you have completed the teach-in step. Otherwise the
column remains empty.
Proceed as follows to select the <name>.H.AFC2.DEP file:
U Select the Program Run, Full Sequence operating
mode.
U Shift the soft-key row.
U
Select the table of AFC settings.
U Show the log file.
HEIDENHAIN iTNC 530 421