Your cells are surrounded by a very important type of lipid, called phospholipids. Phospholipids consist of a hydrophilic (or 'water loving') head and a hydrophobic (or 'water fearing') tail. Phospholipids like to line up and arrange themselves into two parallel layers, called a phospholipid bilayer. This layer makes up your cell membranes and is critical to a cell's ability to function.
On a film or modeling set, a makeup artist may spend six to eight hours doing makeup for the day. For an individual client appointment, the time span may be an hour to three hours. If a makeup artist is working for a bridal party, then he or she may spend the entire day working with clients.
Updated June 12, 2015. How many hours a week do American work? According to the Bureau of Labor Statistics (February 2015), Americans work an average of 38.6 hours per week, slightly under the 40 hours which has been traditionally considered a typical work week. Men worked an average of 41.1 hours per week. Woman worked an average of 36.4 hours per week in paid employment.