We tend to prefer COE / USFS/ other federal campsites with electricity and water - but without sewer. Because usually the water front sites don't have sewer - and they are cheaper. We're about conserving cash as much as water.
It takes about 30-45 minutes most of the time to dump my tanks - black and grey using the SewerTote - while it takes the DW over 45 minutes to prepare the inside of the trailer to bring in the slides before I can move it. And another 45 minutes to reset up after.
It could be faster, but I don't want to go to the expense of getting another DW.