I've just had a look, I think there are 16 locks in the actual flight. You normally plan your day on lock-miles, add up the number of miles and locks and divide by 4 (4 mph is the speed limit). Thats how many hours cruising it will take you to get to your destination. In reality, a single flight and a good crew (that was about the 3rd or 4th narrowboat holiday we'd done with the kids), you can be a bit quicker than that. Once you start you cant stop on that one, allow enough time. The locks are close together, no space to moor up, they had to have large side-ponds for water conservation so there is enough water to keep cycling the locks.
Thoroughly enjoyable holidays those . . .