There are a number of factors that make this a hard question to answer directly, including the number of people using the sleep set, how many hours they sleep a night, the users’ sleeping styles, the users’ body types and sizes, the quality of the sleep set and the materials that are used in it. Generally, many experts suggest replacing a routinely used sleep set of average quality every 8 to 10 years with new, quality bedding in order to get the best comfort and support needed for a good night’s sleep. A better crafted mattress with a warranty of up to 20 years will not need to be replaced as frequently.