i don't think anyone actually answered the question yet.
surely, u should not follow glassblower3000's advice by watering every day.
I would say 1 week max without water, 2 weeks and they are dead.
The question is unanswerable because there are umpteen variables.
I wish I could say 'water every 87 hour, on the 87th hour' but it depends on everything...which is what I tried to explain in my post.
If he said, 'If I water five gallons each watering, how often will I have to water?', then someone in his general location and with some experience could probably give him a halfass close answer. But when you just ask 'when will I have to water?' there is no answer.
If you only give it four ounces at a time, you'll probably have to water every thirty minutes. If you give it 100 gallons at a time you'll probably drown it....but hopefully you get the point.