This is the 864th most frequent Dutch word.
tijdje
A short period of time.
Here, 'tijdje' is used to express a short, indefinite period where the speaker has lived in Amsterdam.
Ik heb een tijdje in Amsterdam gewoond.
I lived in Amsterdam for a while.
Here, 'tijdje' is employed to minimize the duration of waiting, suggesting it was brief.
Waarom wacht je hier al zolang, het is maar een tijdje!
Why are you waiting here so long, it's only a short while!
In this context, 'tijdje' indicates the passing of a somewhat long period since the last meeting.