For Lorna's Unsoaked beans (pressure Perfect), i Find That The Times Are Very Close For my Kuhn-Rikon StovetopCooker. Her Range of Times = The Shorter Time For Firmer beans For Salads And The Longer Times Are For SofterBeans For Soups or Brothy beans. I'm Thinking That it is Difficult to Set Specific Timings Because ofIndividual Conditions Such as Burner Btus or Just When You Catch The Gauge at Precisely The Moment it HitsHigh Pressure or a Minute Later. Heaven Knows That I'm Always Doing Something Else When The Moment of HighPressure Occurs! (an A.d.d. Moment, i Guess.) That's Where The Old Jiggle Tops Were Good....The Sound WouldAlert You! Swish, Swish, Swish....A Rather Comforting Sound!Rita