I've checked time, timex, times even before posting the question and reviewed 'time' now.
As I understand I need in every comand in my screept add the time and get what: time of executing that one command?
Or redirect the time's output somewhere, take the result and calculate a time from beginning of the script?
Very uncomfortable!
That not what I am looking for.

I would assume to be able to put a line anywhere in script something like that: >...