It definitely took me several hours to do everything...and I took my time. I'd say about 4-5 hrs on the boat - (had a volleyball meeting to attend to in the middle of the whole thing!) I used that break to drive the boat around and get all the water sloshed out of the hull. A lot of stop/go and hills.
Edit: Added pics of speedo blowout before the thread subject deviates....keep in mind that the speedo hose is secured by a nut on the back of the gauge so you may have to twist it to remove the tube.
Because of the dry climate, I decided to NOT fog the cylinders. From the two shops I spoke with, they just didn't think it was necessary here in Colorado.