Before Season One began, Ross was living with Carol in a one bedroom apartment. When she left him she moved to a new apartment with Susan. In "The Pilot", Chandler and Joey helped Ross to assemble his new furniture. In season five, after marrying Emily he moved into a new apartment that he was renting from Emily's cousin.
Ross lived in this apartment from "The Pilot" (S1E1) until "The One With The Yeti" (S5E6), a span of 102 episodes.