I was just thinking about this the other day, when I made 5 gallons of IPA. I often make 10 gallon batches of APA and IPA, because it's no more work and takes just as long. But sometimes I only want 5 gallons of one beer, and 5 gallons of something else. Thursday, I made a rye IPA. Five gallons of that is usually plenty. But I also wanted to make an oatmeal stout, and decided that I would do that another day.
But.............the HLT is just sitting there after the sparge, and the MLT is empty. Why not start another brew?!?
I could crush the second batch during the first mash, and of course keep the HLT full during the sparging of the first batch. Then, go right into another mash when the first sparge is done. It'd be just a matter of dumping the MLT then. The mash could go on during the boil, and once the first batch is chilled, I could pump the second batch right into the BK and either batch sparge that one, or fly sparge. Is that about your technique?
But honestly, maybe it's my age or something but I'm tired at the end of a single brewday. Dumping the MLT twice seems to be the only extra effort, though. Maybe if I got my butt moving a bit earlier in the morning it would be easier!