Kitchenaid long cycle

kitchenaid architech series dishwasher working fine last 5 years or so, cycle now taking 3 hours to complete even though display counts down from 70 or 80 minutes but takes a lot longer, lots of crud on upper rack dishes, dishes piping hot when door is opened after it finishes or when I stopped it with 40 minutes left after it had been at 40 for 10 minuted

Check the water level in the dishwasher. Check the chopper assembly (#6 on the diagram) as described in one of our previous posts: http://forum.appliancepartspros.com/dishwasher-repair/2903-whirlpool-dishwasher.html

Here are the breakdown diagrams and Replacement parts for WHIRLPOOL KUDS01DJBL0 | AppliancePartsPros.com

Gene.

chopper assembly and water level appear ok, shut it off 15 minutes into the cycle, dipped my fingers into the water in the bottom, it was quite warm but certainly not boiling hot, shouldn’t it be?

Here is a tech sheet for a KUDS01DJBT1 which may help you figure out what is hanging up and stalling the unit.
https://www.servicematters.com/docs/wiring/Tech%20Sheet%20-%208530866.pdf

Note: there are quite a few different tech sheets available for this series of units but I would need the extra 3 digits of your KUDS01DJ to see if I can find one specific to tour unit.