hǎo jiǔ
我站在这儿等他好久了
Wǒ zhàn zài zhèr děng tā hǎo jiǔ le.
I've been standing here waiting for him for a long time.
好久没收到她的来信了。
Hǎo jiǔ méi shōu dào tā de láixìn le.
I haven't received a letter from her for a long time.