How long would it take to boat down the Nile River?

The length of travel time is going to vary by your mode of transportation. At 6,650 km (4,132 mi) long, with an average flow rate (arbitrarily determined) of 10 kph, it would take 66 hours fifty minutes if you were flosting on a log. If however you were traveling in a boat at 20kph, that time would be cut in half to 33 hours 25 minutes.