YOU SAID:

lets see how long we can make this thing be

INTO JAPANESE

これをどれだけ長くできるか見てみましょう

BACK INTO ENGLISH

Let's see how long this can be

INTO JAPANESE

これがどれくらいの長さになるか見てみましょう

BACK INTO ENGLISH

Let's see how long this will be

INTO JAPANESE

これがどれくらいの期間になるか見てみましょう

BACK INTO ENGLISH

Let's see how long this will be