A:Answer Hello JimU,
We are happy to assist you with your inquiry about the Ninja® 12-Cup Coffee Maker. The warming plate is pre-programmed to stay on for 2 hours from the start of the brew. This can be lengthened up to 4 hours. To change the length of time the warming plate stays on, press and hold the "Stay Warm" button until the clock flashes. Quickly press the hour (H) or minute (M) buttons to adjust it to the preferred time. To lock in the time, press the "Stay Warm" button again.
We hope this information helps.
The Customer Support Team