Funny you should mention this. Big loads of heavily-stained kitchen whites are washed on my Frigidaire's Sanitize cycle. When set to the Max Soil option, the wash tumble time is 70 minutes. It's a testament to the gentle treatment fabrics get in a front-loader that these loads show almost no wear, despite being subjected to the cycle every week.
Lately, I've been wondering if an overnight soak with Biz (or other oxi-type product) and a shorter wash would produce the same outstanding results. I plan to find out this weekend when I'm home and can do a little monitoring/experimenting.
Benefits of Sanitize Cycle:
1) It provides a 'profile wash.' The water is gradually heated, and then held at 151 degrees. This allows each type of stain to be removed at the ideal water temperature from warm to very hot. It also gives today's detergents, with their cocktail of enzymes, plenty of time to work.
2) No extra water or laundry product is required for a soak or prewash (or both). Of course front-loaders use so little water per fill this is certainly not a deal-breaker.
Benefits of Long Soak With Shorter Wash:
1) Less wear and tear on washer. It isn't tumbling for 70 minutes just for the wash cycle. Having said that, I've run two to four Sanitize cycles per week for five years and the Frigidaire has never grumbled---and I wash huge, heavy loads of bath towels on that cycle.
2) Energy savings? Possibly, but not by much. While the washer isn't running for the extra 50 minutes (compared to a regular wash cycle), the savings in electricity is probably offset by the cost of heating the extra water for the soak/prewash. Some people soak in cold water, but products like Biz work better at warmer temps---and the water will gradually cool to room temp during a long soak, anyway.
My mom was an avid overnight soaker. All whites went into the suds-saving side of the laundry sink. In the morning, she'd drain the water, then stack the sopping wet clothes in sorted loads in the sink on the left. Then she'd fire up the Kenmore and the rest of the laundering process proceeded from there. She almost always used the suds-saver for a second or even third load (if the previous loads had been lightly soiled).
We were an HE household back in the early 1960s, LOL.