"Half a year of happiness" in English can be translated as "半年快乐" in Chinese. This phrase comes from the idea of wishing someone happiness for half a year, or for a significant amount of time. Here are some example sentences in English and Chinese to illustrate this concept:

"I hope you have half a year of happiness." (English)

"我希望你有半年快乐。" (Chinese)

"May you experience half a year of joy and contentment." (English)

"愿你有半年快乐与满足。" (Chinese)

"Wishing you half a year of happiness and good fortune." (English)

"祝你半年快乐与好运。" (Chinese)