爱你不是两三天念你不是三五年
[ài nĭ bù shì liăng sān tiān niàn nĭ bù shì sān wŭ nián]
Implies a deep love that has been present for longer than just a few days, along with thinking of someone over many years rather than merely three to five, stressing the enduring love felt over a very long term period.