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 | Length | Class | Circuit | Date |
| --- | --- | --- | --- | --- |
| 24 Hour Pepsi Challenge | 24 hours | All | Daytona International Speedway | January 30 January 31 |
| Coca-Cola 12 Hours of Sebring | 12 hours | All | Sebring International Raceway | March 20 |
| Road Atlanta Grand Prix | miles (km) | GTP/GTO | Road Atlanta | April 4 |
| Road Atlanta Grand Prix | 45 minutes | GTU | Road Atlanta | April 4 |
| Los Angeles Times / Toyota Grand Prix | 6 hours | All | Riverside International Raceway | April 25 |
| Datsun Monterey Triple Crown | 45 minutes | GTU | Laguna Seca Raceway | May 2 |
| Datsun Monterey Triple Crown | miles (km) | GTP/GTO | Laguna Seca Raceway | May 2 |
| Charlotte Camel GT 500 | 500km | All | Charlotte Motor Speedway | May 16 |
| Red Roof Inns Sprints | 1 hour | GTU | Mid-Ohio Sports Car Course | May 23 |
| Red Roof Inns Sprints | miles (km) | GTP/GTO | Mid-Ohio Sports Car Course | May 23 |
| Coca-Cola 400 | 1 hour | GTP/GTO | Lime Rock Park | May 31 |
| Coca-Cola 400 | 45 minutes | GTU | Lime Rock Park | May 31 |
| The NTW 300 | miles (km) | GTU | Summit Point Motorsports Park | June 20 |
| Paul Revere 250 | miles (km) | All | Daytona International Speedway | July 3 |
| Pepsi Grand Prix | 200km | All | Brainerd International Raceway | July 11 |
| California Grand Prix | miles (km) | GTP/GTO | Sears Point Raceway | July 25 |
| California Grand Prix | miles (km) | GTU | Sears Point Raceway | July 25 |
| G.I. Joe's / Toyota Grand Prix | miles (km) | GTP/GTO | Portland International Raceway | August 1 |
| G.I. Joe's / Toyota Grand Prix | 30 minutes | GTU | Portland International Raceway | August 1 |
| Labatt's 50 GT | 6 hours | All | Mosport Park | August 15 |
| Pabst 500 | miles (km) | All | Road America | August 22 |
| Lumbermen's Six Hours | 6 hours | All | Mid-Ohio Sports Car Course | September 5 |
| Sprite 500 | 500km | All | Road Atlanta | September 12 |
| Grand Prix of Pocono | miles (km) | All | Pocono Raceway | September 26 |
| Daytona Three Hour | 3 hours | All | Daytona International Speedway | November 28 |
Question:
What is the length of the Laguna Seca Raceway circuit with a class of gtu?
Answer:
45 minutes