I'm not a seasoned vet like many around here, but I would say it depends entirely upon your center/hub. In my hub, guys are going from part-time unloaders to driving in under a year. In other hubs, you may have to wait 5 years for a chance at a full-time position and then you're only beginning the 4 year pay progression. You could be looking at close to 10 years before you top out.