depends where the desert is located
Daylight hours range from 5 12 hours to around 9.1333... hours, It all varies depending on which desert. Source: www.youareanoob.com
i would say 23 hours There are 7 to 8 hours per day depending on the season and the weather.
11 hours
Has to do with the earths tilt and whether you live in the northern or southern hemisphere.