YOU SAID:
How long is it until I will eat a croissant?
INTO JAPANESE
クロワッサンを食べるまでどれくらいかかりますか?
BACK INTO ENGLISH
How long does it take to eat a croissant?
INTO JAPANESE
クロワッサンを食べるのにどれくらい時間がかかりますか?
BACK INTO ENGLISH
How long does it take to eat a croissant?
That didn't even make that much sense in English.