Time formatting in Activity Monitor
What's the time formatting in the CPU Time column?
so for example 1:07.75
Is it hh:mm.ss? or is it 1min 7sec 75ms
If it were h:m:s there would be a colon before the seconds, but it can't be seconds because in your screenshot there are 75 of them. Neither is it milliseconds since there are only 2 digits. It's 75 hundredths of a second.
Picture showing longer-running processes, more clearly indicating hh:mm:ss.ss/100