Conversation so far:
When did Late Night with David Letterman begin?
On Monday, February 1, 1982, Late Night premiered.
Who were the guests on Late Night with David Letterman?
The first guest, 31-year-old comedian and actor Bill Murray.The second guest was Don Herbert, TV's Mr. Wizard.
Was Late Night with David Letteman show popular in the beginning?
The Late Night with David Letterman reviews were mixed.

Question: How long did it run?
Self-contained rewrite: How long did Late Night with David Letterman run?