Peter,
Today's batch was 955g.
I often make bread using this technique (originally filched from The Best Bread Ever by Van Over) and have measured the temperatures in the past and, even with room temp water and much shorter rest periods, the temperature of the dough doesn't rise more than a few degrees and never, ever close to a level that would kill the microorganisms. The high hydration of these doughs is a buffer against rapid temperature increases. Also the stickiness of the dough probably reduces the friction.
Bill