MNR question

Hey all i got a question about the hiring process at MNR. I took the exam for the track worker position back in March 10, 2015. I was called and told i passed the exam and that i would have to contact Sterling Info systems, Inc to perform a background check. Ive completed that process everything is clear besides one minor accident back in 2012 of December. Its going on September now and im wondering how long does it take for them to get back to you after. I know that the process is a long one just want to figure out a time frame i really want to get in with them. I don't know if there is a list of some sort or what i've been looking around to try and get some info on it anything would be great thanks!