Disregarding regulatory and economic factors:
- Sebring.
- Monza.
- Spa.
- Le Mans.
- Nurburgring.
- Donington.
- Road Atlanta (or, Watkins Glen).
- Suzuka.
- Bathurst.
Regular season events are six hours - with exceptions for Sebring (12H), and Road Atlanta (or, Watkins - 10H/1000 mile).
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