Using my spike solo, I can do a batch (5-15g) in under 3 hours.
When I'm doing low-carb beers, I mash in before work, let it mash for 5 to 8 hours, let the pot drain for 1 or 2, then boil. I'm not at the "station" most of this time. It's asynchronous. I can brew once a week, and be done by 6pm...