In Virginia going 15 mph over the speed limit can be considered reckless driving and is a 4 point violation that would stay on a VA driving record for 5 years. In Maryland a speeding ticket for going in excess of 10 mph over the posted speed is 2 points. Just so you can see the difference in what the different states points systems are.
Maryland and Virginia are members of a Drivers License Compact (DLC) which allows violations to be transferred back to your home state's DMV, so in your case to the MD Motor Vehicle Administration (MVA). According to the Maryland Driver's Handbook convictions reported from other DLC member states are treated in the same manner as if the offenses occurred in Maryland.
It has been said that under Maryland traffic statutes, points are not ordinarily transferable for out of state citations unless it is serious offense, but you will need to verify this by contacting the MVA. While points may not be assessed to your MD driving record, the MD handbook does confirm that moving violations from other states will be recorded on your Maryland Driving Record.
If points are assigned, they will remain on your driving record for two years; however the violation itself remains on the driving record. If you have more questions you should try contacting the MD MVA. If you find them not to be of help the MD Driver's handbook or the website for district courts can be helpful. The MSD district court's traffic website is www.courts.state.md.us/distrtict/selfhelp/traffic.html.