One other item which I find invaluable in the darkroom is a talking timer or two. They're easy to find here in Oz at electronics shops such as Dick Smith, so presumably you can get them in NZ too. They cost about twenty bucks and have a countdown feature. It means you don't need to keep an eye on the clock, but you just listen to the lady - she counts down in minutes, then below one minute it's every ten seconds, and below ten seconds it's every second. Using two together is even better.