Counting the Hours | FlowingData
▻http://flowingdata.com/2015/11/10/counting-the-hours
More specifically, participants recount their time spent from 4 a.m. the previous day to 4 a.m. the survey day. The data is processed and weighted so that days and demographics closer represent the population, which is necessary, because a majority of responses happen on weekends, and some demographic groups are less likely to respond. Only civilians who are 15 and older are included.