英语高手请帮帮忙！！！请问以新托福 100分的基础，准备考SAT2000分 大概需要准备多少天呢？

It is rather hard to tell you
As you know Sat is totally different from Toefl; at least harder than Toefl 10 times.
I used 3 months to crack and I only get a result of 2070 in sat1 and 2350 in sat2 (Biology M)

It differs between person to person.

I come from Nanjing Foreign Language School. Our English is strong. Many of us get 2050 first time and 2200+ the second time. I am not feeling like taking the second, so I give up and use the first score. Of course the less time you reach a perfect score, the stronger your scores will be. My deskmate received 2310 the first time. However he is only studying english all day with rather poor maths and so on.

You may take model tests both online and in paper form. That is the best way to see how much you can get.
Good luck.
Yours Wenyang

Maybe it is kind of hard for chinese high school students, but believe in heart one thing that nothing is hard if you put your whole heart into it. S