If you are concerned about time, I would think about nappies that can go in the dryer. I usually hang my nappies on the line, but when we are having one of those weeks, I chuck them through the dryer.

The BBH - I dry on low heat (because I know that the heat damages the elastic in the legs). The Greenkids - I dry the insert in the dryer (on low or high) & I just hang out the outer on the line. Flats/prefolds should be fine in the dryer too.