What dishwasher had or has the longest main wash cycle? Seeing GE dishwashers with a default 56 minute main wash got me thinking, excluding overnight wash cycles, how long has the main mainwash gotten? Also, how are these long cycles not etching dishware? 

3 Hours? Do the wash arms rotate or does the wash stop? Seems extreme I wonder what the logic behind it is.

Bit to long for my likes, even with what I guess is an A++ energy rating. Though I would partly forgive the length of time for the machine being quiet. 

When GE added the fine filter to their 1970s design, they reduced the water charge to about 1.1 gallons and to compensate reduced the flow rate of the main wash arm. Coupled with literally plus sized wash arm holes (5 at the top, at least one at the bottom for the fine filter water sweeping) and a ridiculously fast rotation a 60 minute wash time was a given. 

But- that pales in comparison to the their tall tub models which literally used a brushed motor IIRC 🤮 That is literally the definition of blatant obsolescence. You literally have wet rotor magnet pumps, you literally have sine wave AC at the incoming line, you literally have low cost VFDs at your disposal. Yet decide a tiny brush motor is somehow practical for a DW.  I agree, like what were they thinking. 

Nnoooooo.... I like constant speed across the line pumps. But I hear you, a VFD 3 phase induction motor would have been light years ahead than all the other stuff they did.

They've forgotten the basis of electrotechnology at the key to its legendary monster smash success. Have the necessary information for rotation, induction and timing delivered from central location instead of produced within the appliance itself. Nothing is gained tossing out the timeless simplicity to then re-invent a much more complicated, expensive and trouble prone wheel. Its like blocking out the sun via a giant wall around a home, then trying to re-create the sun in a cold fusion reactor deliver its artificial light output through the same windows the sun would otherwise have shown through.    

Some of the newer ones probably are. Which is a step forward. Perhaps GE learned from their past mistakes.

Hopefully. I'm still upset the discontinued their standard tub models. with a filter there was nothing else like them.

I haven't heard a GE dishwasher recently. Modern appliances I tend to stay away from for the sake of my happiness lol.  But if they are wet rotor pumps GE is back to taking at least one thing seriously. Across the line AC motors have the longest life expectancy, reliability and durability by far. About the only place brushed motors are practical is in hair dryers, mixers, drills and similar appliance/tools where the number of hours per year run time is limited.