I used to brew. Went all grain pretty quick, batch sparging, as the concentrate stuff always had an odd flavor/after taste to it.

Sanitizing the bottles goes pretty quick with the right equipment. I had a nozzle thing that went on the kitchen faucet, and sprayed water in the bottle, and then a bottle sanitizer that you invert the bottle on, press down a couple times and toss on the rack. If you use something like star-san there's no need to rinse afterwards, just dip and go.