I just got a great cookbook of healthy slow cooker recipes. Trouble was I didn't have 6-8 hours to set it cooking before dinner, so I used the same recipe but in the pressure cooker. It worked perfectly.
I guess the stewing process of the slow cooker is similar to the pressurized stewing process in the pressure cooker. For timing I used the time it would normally take for the longest-cooking ingredient, in this case it was dried lentils.
I'll post the sbd friendly lentil soup in recipes. It was delicious!
Hope this is useful to somebody!