Urgent: JD doubt

Hello everyone. I have a doubt. I read in a Spanish forum that the use of different JD, is good for the construction of our future car.

I have read that in elite category if you want a part of the car to have 50 starting points, you must use a JD at least 3 races.

So I think ... an UTOPIA. If the season has 16-17 races, I could use 5 different JD keeping only 3 races each and I will get a car with many areas at 50.

MY QUESTION for you is: Is it true that you only need to maintain 3 RACES the JD to get the area bonus?

THANK YOU I need to know.

A 4.5 or 5 star CD needs to be active for 6 races to achieve 50 dp. This assumes that all other CDs that may be active throughout the season are also 4.5 or 5 star.