An infomercial is a form of television commercial, which generally includes a toll-free telephone number or website. Most often used as a form of direct response television (DRTV), long-form infomercials are typically 28:30 or 58:30 minutes in length. Infomercials are also known as paid programming (or teleshopping in Europe). This phenomenon started in the United States, where infomercials were typically shown overnight (usually 1:00 a.m. to 6:00 a.m.), outside peak prime time hours for commercial broadcasters. Some television stations chose to air infomercials as an alternative to the former practice of signing off. Some channels air infomercials 24 hours. Some stations also choose to air infomercials during the daytime hours mostly on weekends to fill in for unscheduled network or syndicated programming. By 2009, most infomercial spending in the U.S. occurred during the early morning, daytime and evening hours, or in the afternoon. Stations in most countries around the world have instituted similar media structures. The infomercial industry is worth over $200 billion.