CSR 2 | CSR Racing 2. How many paid crates for LEXUS S6s?

I decided after four free crates to start spending for paid crates to move towards maxing out the Lexus on S6s. This part is not the painful one. I was able to do it relatively quickly. The next part is waiting on free crates, doing the flash event and finding a way to get the Lexus LFA fully elite.