三年熬七年痒
[sān nián áo qī nián yăng]
Translates to 'Three years of patience; seven years of itchiness.' This phrase plays on the saying 'seven-year itch,' referring to growing boredom or dissatisfaction after years in a stable relationship. However, it also suggests enduring hardships (three years) followed by possible discomfort and change after many years.