R180

Does anyone know how long the background investigation takes and how in depth they get. I actually finished school car last month, but I actually stayed at my other job an extra 2 weeks (sick leave) because I wanted to make sure I would be able to make it through the training before letting go of my full time gig. would this be something they would hold against me. I've asked 2 of my prior managers if they have been contacted as of yet and they both say no. So does the check focus more on criminal elements?