Have been up and down Hatton a couple of times last year and hopefully again this Easter.
We found the locks well maintained and we had no problems. Some of the pounds are quite big so a bike is a good idea if you've got one to send the wife off to get the next ones ready!!
No dedicated lock keeper that I know of but often friendly staff about.
Theres a BW cafe a couple of locks from the top to either get your strength up before, or revive you as you complete the climb.
Difficult to say how long it takes to get through (we shot through in just under 3hrs) but it does pay to try and team up with another boat if possible.
Geoff