It shouldn’t take long for a score to be checked, maybe about 3 months, however you are also rated on how long you’ve had credit. I worked in the car buisness and had a customer that had a 700+ score and couldn’t get a car loan cause he hadn’t established enough credit history.

You will need to establish a payment history before you will get a credit rating. Usually takes several months of payments before they begin to see a trend. Make sure that your payments are on time or even early. It takes time, but it’ll take longer to repair your credit if you don’t make payments on time starting right away.

Give it at least 3 months.
And checking your score does nothing. What is important is seeing your credit reports and reporting any errors.
You might want to update your employer and profession.

Landlords look for defaults and late payments. Hey, if you really want the apartment this is what I did.
It was a gorgeous apartment next to a river. I knew she did not want me because I was so young.
I saved up and offered her 3 months rent up front. That’s on top of deposit and last months rent. Of course, she could not refuse.
If you really want something, save up for it.

Well landlords look for other apartment buildings that have placed collections, as well as poor credit history. If you have no credit score they most likely won’t deny you. Waylan made a good point as well, its equally about payment history as well as credit score. You may just have to get a reference from your financial that says they feel you are a good fit for an apartment, that will show initiative to the landlord as well. Good luck.