If I prep my grain the day before and have my water additions ready, I can come home to water already heated and mash in immediately, then go mow the lawn or play with the kids for 45 minutes, then pull the bag and get the boil started, then go off and do something else for another 30 or 40 minutes, then I need to finish up the boil chill and dump to a fermenter.
12 gallons to the fermenter, double batches.
Total time from mash in till clean up, 3 hour and 15 minutes and the grass is cut or the kids are fed, etc.
I like my setup, that is for sure !!
https://www.homebrewtalk.com/showthread.php?t=448915&page=2
Kevin