jiǔ
久别
jiǔ bié
long separation; haven't seen for a long time
久经锻炼
jiǔ jīng duàn liàn
tempered through long experience
我离开家乡已经很久了丨你来了有多久？丨历时三个月之久。
wǒ lí kāi jiā xiāng yǐ jīng hěn jiǔ le | nǐ lái le yǒu duō jiǔ? | lì shí sān gè yuè zhī jiǔ.
I have been away from my hometown for a long time | How long have you been here? | It lasted as long as three months.