[Roverlord]

I give mine a pint of water every week or two. If it wilts I water it regardless. It's been happy in a bright room near a sunny window in the UK for 10 years. Current pot is around 10" diam and 10" high for comparison.

If ever in doubt I let it tell me - it's all about the wilting, if it starts to wilt, give it water, if it's not wilting, you can wait, if you haven't seen it wilt for a while, might as well let it dry some more to avoid root rot. I also trim off dead flowers and leaves just to give the other leaves more light but I don't think that matters.