My Kitchen Aid dishwasher runs for about 2 hours. Is this normal

http://www.manualslib.com/manual/87792/Kitchenaid-Kude60fvpa.html?page=2#manual

Ah, the famous (or infamous) Clean-light blinking problem. Watch that blinking light.... Does it blink 7 times, pauses, and repeats? Or does it blink 3 times (or some other number). The most common problem is 7 blinks wich means "water not heating error". This could be caused by a bad heating element, a bad thermal cutoff, a bad controller; or the problem could be that 1 of the 2 switches inside the door latch is not getting engaged fully. Most of the time, I find that the cause to this problem deals with the latch, or the switches in the latch. If something (like a soda) gets spilled into the latch, it can cause the plastic parts to stick and not slide to engage the 2 door switches. You might need to take the latch out (unplug the dishwasher first!), remove the switches, and clean the plastic parts with water, dry it, and then re-assemble. The other thing to check is the door strike, which is supposed to push down the latch. The springiness of this metal part may be weak. You can remove it (without pulling out the dishwasher), by using a small screwdriver to release the little catches on either side of the "tongue" or "tang". Bend the center part down slightly more to give it more force, and then re-insert it. Then run the diagnostic cycle (by pressing the following sequence of keys: Heated Dry - Normal - Heated Dry - Normal; or High Temp - Air Dry - High Temp - Air Dry; or Hi Temp Scrub, Energy Saver Dry, Hi Temp Scrub, Energy Saver Dry; or High Temp Wash, Heated Dry, High Temp Wash, Heated Dry), let it run for a few minutes, and then press Cancel to stop the dioagnostic cycle and clear the error.
Note: On some of the newer Whirlpool, Kenmore, KitchenAid dishwashers, you start the diagnostic cycle by rapidly pressing the 3 left-most keys in the following sequence: 1 2 3, 1 2 3, 1 2 3.

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Did you check behind the toe-kick panel for the tech data sheet? Assuming that you have checked and that it is missing, there here is the "secret keystrokes" that will make most Whirlpool/ KitchenAid/Kenmore/Maytag diswashers enter the diagnostic cycle:
Heated Dry - Normal - Heated Dry - Normal; or
High Temp - Air Dry - High Temp - Air Dry; or
Hi Temp Scrub, Energy Saver Dry, Hi Temp Scrub, Energy Saver Dry; or
High Temp Wash, Heated Dry, High Temp Wash, Heated Dry.

Note: On some of the newer Whirlpool, Kenmore, KitchenAid dishwashers, you start the diagnostic cycle by rapidly pressing the 3 left-most keys in the following sequence: 1 2 3, 1 2 3, 1 2 3.

If you need further help, reach me via phone at https://www.6ya.com/expert/ronald_e6b9572cebe3ad27

Is heat dry selected? Are you using rinse aid? Is it draining completely at end of cycle?

You might try using Jet Dry in your rinse aid dispenser, but plastic things tend to hold water and there isn't much you can do except try using Jet Dry.

I am assuming the problem does not go away when you turn the mains power off and on.

The problem is linked to the temperature variation in the incoming water.

This confuses the diswasher. You have to reset it now. Try this sequence..

Press heated dry, normal heated dry, normal quickly within 5 sec. All lights should light up.

Advance through the cycles by using the start button

Please post a comment to confirm if this helps.

The best way to clean it out is to run a empty load with a coffee cup full of vinager on the top rack, you might need to do this a few times to get all the gunk out. As fas as the drying goes check you heating element at the bottom of the tank and look for breaks.

To invoke the diagnostic cycle, perform the following key presses in less than 6 seconds while in standby.

Heated Dry -> Normal -> Heated Dry -> Normal

Invoking the diagnostic cycle clears all status and last run information from memory and restores defaults. It also forces the next cycle to be a sensor calibration cycle. (quoted from service diagnostic cycle notes in troubleshooting guide)

I know is sounds strange, but on a typical Kitchen Aid dishwasher, cycles can go longer because the the dishwasher is waiting for the water be raised to the proper temperature, especially during a hot rinse cycle.
Checking that the heating element is working would be the first thing to check.
If the heating element is working, the probable cause is a failed console (which controls the logic/programming of the dishwasher.)
Good Luck!

On mine the "normal" light was the one that was flashing; after a cycling of the breaker switch in the electrical main panel and closing the washer door, it went to a 2 minute rinse before shutdown.