This is the 6522nd most frequent Chinese word.
數月
Several months.
Here, '數月' conveys a time duration during which an activity took place, referring to 'several months'.
數月後，我終於完成了這本書。
After several months, I finally finished this book.
Here, '數月' indicates an approximate duration of time, meaning 'several months'.
我已經學習中文數月了。
I have been studying Chinese for several months.
In this sentence, '數月' signifies an estimated point of time in the future, usually 'several months' away.