Time format

[seraph]

Hello, i have a question about changing time format in draft generated from SheetMetal nest document (Called operator card).
There is Total_time_info and eg.: time_per_part variables. These variables show time in seconds. I want it to change to classic format such as hour:minut:second.
I try to alter it in File-Properties in bookmark Units (Types - time change from s to mn), but it has no change.