Disable or change U2413 sleep timer?

When a monitor's not connected to a computer the LED/LCD will light and a message box is displayed stating that no cable is attached. The monitor remains on for a few minutes and then it turns off.

Is there a way to change the time it takes before the monitor turns itself off?

When calibrating and profiling 2 monitors I would like to keep the second monitor on, even though it's not connected, so that it does not cool down too much while waiting it's turn. Doing a Cal1 (AdobeRGB) and Cal2 (sRGB) for a monitor using the large patch set can take 20 minutes or more.

Is there some way to modify the energy saving setting to extend the time the monitor will remain on?