Different states have different lengths of sex offender registration. Maryland has 3 lengths of registration: 15 years, 25 years and life. The length of registration is determined by the sex offender's conviction. For Maryland convictions the chart in question 1 explains which convictions carries what length of registration.
Tier III = Lifetime Registration Tier II = 25 Years Tier I = 15 Years
Non-resident registrants who are working or attending school in Maryland must register for the period of time specified for the category of registration, or until the registrant's employment or student enrollment in Maryland ends (if that occurs before termination of the registration period).