Can you get a CDL after 1 DUI and If so How long?

You can get a CDL. That part isn't the problem. It's finding employment which is the difficult part. Ideally, you should have at least seven years between your DUI convicted and seeking employment as a CDL driver. If you have five or six years between conviction and seeking employment, you can cope, but it will present obstacles. Less than five years between a DUI conviction and seeking employment, your odds are extremely slim. Less than three years between a DUI and seeking employment, you might as well forget about it and find greener pastures for yourself.