YOU SAID:
The apartment has been burning for decades!
INTO JAPANESE
アパートは何十年も燃やしている!
BACK INTO ENGLISH
Apartment has burned many decades!
INTO JAPANESE
アパートは、数十年に焼けました!
BACK INTO ENGLISH
Apartment was burned in decades!
INTO JAPANESE
アパートは、数十年で焼かれた!
BACK INTO ENGLISH
Apartment was burned in the last few decades!
INTO JAPANESE
アパートは、最後の数十年で焼かれた!
BACK INTO ENGLISH
Apartment was burned in the last few decades!
That didn't even make that much sense in English.