爱你有多久心跳有多快
[ài nĭ yŏu duō jiŭ xīn tiào yŏu duō kuài]
The user conveys a poetic metaphor for expressing affection. 'The length of loving you correlates with how quickly my heart beats,' which implies that their heartbeat signifies how long and profoundly they've loved someone - indicating the connection between love duration and intensity.