Agree with Iceman - 5 laps per race minimum (have pit stops if need be)
They have to run on a VLN weekend (no marshal or spectator would show up for so few laps) - NOT the 24hr, as they would look a very poor support.
Support races can run on the GP circuit (this happens at the 24hr)
Not enough cars, circuit would look empty - run another touring car race (Euro Cup?) at the same time, starting 60 seconds after the WTCC (national GT championships did this sort of thing at Spa)
Given that GT2 cars run at the VLN/24hr, there can be no safety reason for it not to happen other than having enough marshals etc.. (which as I said, would be dealt with by running same weekend as VLN)
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