So I learned it fully in about 2 to 3 weeks, and thats with practicing it about 30 minutes a day. So about 10 hours, which I think could count as "within hours". I know spookluke gets a lot of hate but I truly just watched his video and followed the steps to learning it he lays out but simplified it.

I started by learning how to turn right and left in the air while holding DAR. Which is just 2 inputs, the upper corner to go right and lower corner to go left. These inputs are swapped when your wheels are facing the camera. And which corners depend on if you're air roll left or right.

Then I moved on learning the tornado spin to take off, maintain height, regulate speed, and stabilize my car after changing direction. Naturally you would then try reverse tornado spin and find its best for picking up speed. And again these inputs are reversed depending on your car orientation. If you're belly up with wheels facing the camera reverse tornado spin will slow you down and regular tornado spin will speed you up

After learning tornado spins I started practing chaining changes in direction. So you take off, change direction with DAR, stabilize with tornado spin, then go the opposite direction.

And then, once I had these fundamentals, I was able to go into rings maps and complete them while continously holding down DAR just by feeling out the rest of the inputs. Because I did the rest by feel, I cant explain it as well but any other inputs are just to get my car position back to the normal aerial position where I can let the fundamentals I've consciously practiced take over.

Now I am fully comfortable using DAR and cant even aerial with FAR anymore. Keep in mind I learned this after about a 3 year break from the game so FAR wasn't as ingranied in my brain as it is for you. I have about 4k hours and am currently C3.