YOU SAID:
Becky has been peeing for a long time
INTO JAPANESE
ベッキーは長い間おしっこをしていた
BACK INTO ENGLISH
Becky had been peeing for a long time
INTO JAPANESE
ベッキーは長い間おしっこをしていた
BACK INTO ENGLISH
Becky had been peeing for a long time
That didn't even make that much sense in English.