| 1 | A | B | C | D |
| --- | --- | --- | --- | --- |
| 2 | The Tonight Show - Hosting history |  |  |  |
| 3 | Host | Start date | End date | Episodes |
| 4 | Steve Allen | September 27, 1954 | January 25, 1957 | 2,000 |
| 5 | Ernie Kovacs | October 1, 1956 | January 22, 1957 | 2,000 |
| 6 | Jack Lescoulie | January 28, 1957 | June 21, 1957 | 2,000 |
| 7 | Al "Jazzbo" Collins | June 24, 1957 | July 26, 1957 | 2,000 |
| 8 | Jack Paar | July 29, 1957 | March 30, 1962 | 2,000 |
| 9 | Various hosts | April 2, 1962 | September 28, 1962 | 2,000 |
| 10 | Johnny Carson | October 1, 1962 | May 22, 1992 | 4,531 |
| 11 | Jay Leno (first tenure) | May 25, 1992 | May 29, 2009 | 3,775 |
| 12 | Conan O'Brien | June 1, 2009 | January 22, 2010 | 146 |
| 13 | Jay Leno (second tenure) | March 1, 2010 | February 6, 2014 | 835 |
| 14 | Jimmy Fallon | February 17, 2014 | present | 1,059 |

Question: How many episode did O'Brien host before Leo was brought back as host ?
Answer: O'Brien hosted 146 episodes over the course of less than eight months before Leno was brought back as host, where he served for almost four additional years.