What do the colours in the work-rest hours mean? MXSuite distinguishes between rest hours and short breaks. According to MLC 2006 short work breaks are not considered as rest hours. Depending on the settings in MXSuite, a working interruption of a maximum of 2 hours may or may not be counted as rest hours. Rest hours are indicated with a white background color. Work hours are indicated with a dark blue background. Short work interruptions that are not viewed as rest hours are indicated with shading.