I took it because no one else call me back and I needed some money.
I took a job just to have money. The job don't pay good. I been there for a month. If I want a better job how long should I stay at this job?

Until you have confirmation that you got the new job and can begin
I know some jobs may think why I'm looking for another job when I been at my job now for a month already
Opinion
2Opinion
Probably at least 1 to 2 years. If you don’t like it that much, get outta there.
Is it an entry level job?
Superb Opinion