Fustion time for a B car to 4 stars ?

I used fusion for first time to get one for 3 stars, and just realized it needed 8 hours to get completed and i was unable to race in the last event, so i lost at least 160 points...
So, planning use fusion credits for a 4 star car, but scared the fusion time instead of 8 hours became 24h or similar that will be lose around 500 points due not available to race in the event.
Any idea?
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