I agree with lin and hamwild, I also water mine thoroughly until it drains from the holes! I think the term overwatering means you are not letting the soil dry between waterings! They can handle as much water as you can give them in one sitting as long as you let the medium dry before you water again! Underwateing is when they don't get enough water each time you water and while you might be watering more often it would still be considered underwatered!
I mentioned the cooler room because my orange one rebloomed this summer after I pruned it and put it in a cooler room! There was no dark period as it was summer and it bloomed regardless, maybe there was something else at play here I wasn't aware of? I also read that while a dark period is enough to induce blooms its night time temps that determine how long the blooms last! Warmer night Time temp will result in blooms fading faster whereas cooler night temps will slow growth and prolong blooms. I have not researched much about that so I can't say if there's any truth to that or not.
