YOU SAID:
I don't want to go to school in eleven days
INTO JAPANESE
11日後は学校に行きたくない
BACK INTO ENGLISH
I don't want to go to school after 11 days
INTO JAPANESE
11日経ったら学校に行きたくない
BACK INTO ENGLISH
I don't want to go to school after 11 days
You've done this before, haven't you.