One day without seeing you is like three autumns apart:
One day without seeing you is like three autumns apart (yī rì bù jiàn, rú gé sān qiū), a metaphor for the mood of living like a year (commonly used to describe a lover's relationship) It can also be used to describe the longing between mentors and friends). Sanqiu generally refers to a long time. "One day without seeing is like three autumns" specifically refers to how long it takes, but it is actually meaningless.