The first episode of "Dancing with the Stars" is about 1 hour and 45 minutes long for recent seasons. For example, the premiere episode that aired on September 26, 2023, had a runtime of 1 hour and 45 minutes. Historically, episodes have varied, but the typical premiere is around this length. The very first season’s episodes aired starting June 1, 2005, but the exact length of that initial episode is not explicitly listed; however, newer premieres like Season 34 tend to be about 2 hours long.

So, in summary, the first episode generally runs between 1 hour 45 minutes to 2 hours.