YOU SAID:

this is the longest thing i can thing of at the time

INTO JAPANESE

これは当時私ができる最長のものです

BACK INTO ENGLISH

This is the longest thing I could do at the time

INTO JAPANESE

これは私がその時にできる最長のことです

BACK INTO ENGLISH

This is the longest thing I can do at that time

INTO JAPANESE

これは私がその時にできる最長のことです

BACK INTO ENGLISH

This is the longest thing I can do at that time