Table:
text: 1978 IMSA GT Championship season
Schedule
Schedule
Race Length_ Class_ Circuit Date_
24 Hours of Daytona 24 Hours All Daytona International Speedway February 4 February 5
12 Hours of Sebring 12 Hours All Sebring International Raceway March 18
6 Hours of Talladega 6 Hours All Talladega Superspeedway April 2
Camel GT Challenge mi (km) GTU Road Atlanta April 16
Camel GT Challenge mi (km) GTX/GTO Road Atlanta April 16
Monterey Triple Crown mi (km) GTX/GTO Laguna Seca Raceway April 30
Monterey Triple Crown 45 Minutes GTU Laguna Seca Raceway April 30
Hallett Grand Prix 1 Hour GTU Hallett Motor Racing Circuit May 7

Question: How long is the 6 Hours of Talladega for the 1978 IMSA GT Championship season?