I usually do single batches, but with a long streak of rainy weather, working mass overtime, and a single function emptying my kegerator, I needed to brew.
Did the first batch, when it went on to boil, emptied the mash tun and started the second brew. Having two burners helped. When the first one was chilled to 85, it went into the conical, dialed down to 65, and started the third mash. The second had plenty of time to chill, when it hit 68, into the carboy. The third batch was finished, and in the other conical at 5, dialed it down to 65. Pitched my yeast at 6, this morning all three are bubbling away.
Kept track of mash times and boil times on a notebook. It was a busy day, but worth it. Hopefully, I'll be able to go back to my batch a day routine, more relaxing, able to kick back and enjoy a few extra pints that way!