A long event or period of time lasts for a great amount of time or takes a great amount of time.
长时间的
You use long to ask or talk about amounts of time.
长久地How long have you lived around here? 你在这附近住多久了?
If you long for something, you want it very much.
渴望; 极想念Steve longed for the good old days. 史蒂夫怀念过去的好时光。
"Did you live there?"—"Not for long." “
你以前住在那里吗?”—“没住多久。”