As an adult, how long do you stay in a custodial job?

I'm a cleaner for Macy's. I have a 7.5 hour shift to clean everything by myself 5 days a week. There is a very long list of things to do, and for the sake of keeping this brief, I'll just say its a completely shit, terrible, stressful job and I'm treated very poorly. The details of what I do aren't needed.
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 My issue here is that I'm an adult, not someone right out of high school. But at the moment this is the job I could get, and what I needed. I only want to stay in this job as long as I have to, to be able to put it on my resume. 
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(Ive moved countries and this is my first job in this country, so I NEED to be able to put it on my resume).
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QUESTION:
How long should you stay in a custodial job to be able to put it on your resume?
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NOTES:
A custodial job doesn't change and there is no opportunity for advancement. It can't even be called a stepping stone in my career. Its just a job that provides money. I do the same thing every day, day in and day out. Its also not a job that I can "make a difference in". I have a list of things to do and do them.
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So being that this job is so unchanging, I'm not sure of an acceptable amount of time to stay in it so that it doesn't look bad to an employer if I leave before a year of being in it

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