其实两者都可以用:
They hid themselves in the mountain for half a year. 他们躲在山里达半年之久。《简明英汉词典》
The term of practice is tentatively fixed at half a year. 实习期限暂定半年。《现代汉英综合大词典》
He was banged up in a Nepal jail for six months. 他在尼泊尔一座监狱里关押了六个月。《简明英汉词典》
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