"365 days; the time when I got to know you"
=> 삼백육십오 일: 내가 널 아는 데 걸린 시간. (the time it took me to get to know you)
"8760 hours; the time when i fell in love with you"
=> 팔천칠백육십 시간: 내가 널 사랑하게 되는 데 걸린 시간. (the time it took me to fall in love with you)
"One second: the time I decided to leave you"
=> 일 초: 내가 널 떠나기로 결정하는 데 걸린 시간 (the time it took me to decide to leave you)