From my experience around 15-20 minutes, depending how much water you put and how soft or moist you want the rice to be. If you put hot/boiling water it might take even less time than that.

In my experience around 30 minutes. The cooker beeps once when the rice is cooked and then another 3 times if left to stand for 5 minutes. After the standing time the appliance, if not turned off, switches to keep-warm mode for 40 minutes. I use one and a half cups of water for each cup of rice.