The time it takes to obtain an ATPL (Airline Transport Pilot License) generally varies between 3 to 5 years. This includes completing the required flight hours (typically 1,500 hours), attending ground school, passing theoretical exams, and meeting medical standards. The duration also depends on factors such as training intensity, personal progress, and the type of flight school attended. Most pilots begin with a PPL (Private Pilot License) and then progress to a CPL (Commercial Pilot License) before finally achieving their ATPL.