Do early dismissals count as full days of instruction?

The Maryland State Department of Education considers a full school day when the school is open for instruction for a minimum of three hours. 

On half days, all schools dismiss no more than three hours early, leaving a 3 ¾ hour instructional day for middle and high schools and a 3 ½ hour instructional day for elementary schools. Schools also must meet the state hours requirement of 1,170 at the high school level and 1,080 at the middle and elementary school levels annually.