Maryland Code, Correctional Services § 11-506

(a)(1) In addition to any other deductions allowed under this subtitle, an incarcerated individual may be allowed a deduction of not more than 5 days from the incarcerated individual's term of confinement for each calendar month or portion of a calendar month of presentence or postsentence confinement during which an incarcerated individual manifests satisfactory industry, application, and progress in special selected work projects or other special programs.

(2) The deduction described in paragraph (1) of this subsection shall be calculated from the first day that an incarcerated individual is assigned a project or program.