Air/steam sterilization cycle

What are the tolerances of variation of pression and time during sterilization phase?
I have a Air/steam sterilization cycle; set parameters are 122°C 20 minutes, 3,5 bar
For the temperature as indicate by the manufacturer, it is -1°C/+1°C
but I can’t find references for the pression and time.

Thank you

According to EN285 paragraph 10: The maximum rate of pressure change during any part of the sterilization cycle shall not exceed 10 bar/min (1000 kPa/min).