Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Race | Class(es) | Length/Duration | Circuit | Date |
| --- | --- | --- | --- | --- |
| Rolex 24 At Daytona | DP/GT | 24 Hours | Daytona International Speedway | January 26 January 27 |
| Gainsco Grand Prix of Miami | DP/GT | mi (km) | Homestead-Miami Speedway | March 29 |
| Mexico City 250 | DP/GT | mi (km) | Autodromo Hermanos Rodriguez | April 19 |
| Bosch Engineering 250 at VIR | DP/GT | mi (km) | Virginia International Raceway | April 27 |
| RumBum.com 250 | DP/GT | mi (km) | Mazda Raceway Laguna Seca | May 17 |
| Lime Rock GT Classic 250 | GT | mi (km) | Lime Rock Park | May 26 |
| Sahlen's Six Hours of the Glen | DP/GT | 6 Hours | Watkins Glen International (Long) | June 7 |
| EMCO Gears Classic | DP/GT | mi (km) | Mid-Ohio Sports Car Course | June 21 |
| Brumos Porsche 250 | DP/GT | mi (km) | Daytona International Speedway | July 3 |
| Porsche 250 Presented by Bradley Arant | DP/GT | mi (km) | Barber Motorsports Park | July 20 |
| Circuit Gilles Villeneuve | DP/GT | mi (km) | Circuit Gilles Villeneuve | August 1 |
| Crown Royal 200 at the Glen | DP | mi (km) | Watkins Glen International (Short) | August 8 |
| Armed Forces 250 | DP | mi (km) | Infineon Raceway | August 23 |
| Supercar Life 250 | DP/GT | mi (km) | New Jersey Motorsports Park | August 31 |
| SunRichGourmet.com 1000 | DP/GT | km (mi) | Miller Motorsports Park | September 20 |
Question:
What was the date of the race that lasted 6 hours?
Answer:
June 7