I go up and down the trent a lot delivering collecting boats on my own ,Listen to mrs smelly,dont listen to the scare mongers YOU control the force of water with a simple press of the button ,depending on flow nottingham to newark is around 7/8 hours add an hour or 2 for coming back up stream . if your not nimble tho the lock walls are a but hight to get on and you may need to use the ladders to get on and off at burton joyce, gunthorpe, and hazzleford ,,all the locks have moorings available ,lock keepers start officially 31 march but some do start week before ,and for mooring in newark use the floating jetty and turn to come back upstream to moor there is a good flow on that bit