I've grown two D ordensis plants since March 2006 without them ever really going truly dormant. Every now and again, they start to produce progressively smaller leaves, and eventually produce very woolly leaves about 1cm long with no functioning traps. I tend to leave them in this state for a few weeks and then repot them. They then begin to grow vigorously again almost immediately. It may also be worth mentioning that, in March this year, I received a D falconeri and a D caduca in the post from Lowrie in Australia (I live in England). Both plants had dried out somewhat on their arrival. I potted them up and put them in warm, bright conditions, sitting in a little water. Both looked completely dead- all that was left of each plant was a small bulb and a few dead leaves. After a few weeks, the caduca began to grow, but the falconeri remained completely dormant for over two months. I thought it was dead, and picked at the bulb, revealing some green underneath the brown outer surface of the bulb. Within about two days, it began to grow, and has looked progressively more impressive every day since. This may have been a fluke, but I suspect that disturbing the bulb in this way may have stimulated it into growth.
Cheers,
Greg