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IMSA has 2 tools in their box: Full Course Yellow and Full Course Yellow. The first one is always the standard procedure so with all the wave & pass arounds and class splits. Takes forever.
The second one is the short procedure where the pits gets closed, less wave & pass arounds and class splits as result and back to green much faster.
If the second yellow comes within a certain time frame of the first, standard FCY, the shorter version comes out. And so on.
Towards the end, within 30 mins of the checker, the shorter version comes out. The last (?) caution got called with 34 mins left in the race so it was the standard version.
All the teams know exactly what the caution procedures are, IMSA is very consistent in that regard so no surprises when it comes to that. Certainly not satisfying imo but as long as all the involved manufacturers and team agree to it, it'll stay.
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