Broken AI pitting time

Hi,
I've been trying to have an enjoyable enough singleplayer experience on Le Mans against AI, in a 5H hours race. Everything is working okay except for one important thing: the AI pitting time.
A full tank refill + tyre change takes them 12 seconds while it takes 35 seconds for me, using the same car which is the 919 Hybrid 2016 (I haven't really checked other cars but I assume there's the same issue). This makes the race impossible to truly enjoy because you lose more than 20 seconds every time you pit, making it more than 2 minutes with 6 pits in total over the 5 hours.
Is this a known issue? And if so, is there a fix to it?
 
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