CREATE TABLE table_30724 ("Team" TEXT, "Head Coach" TEXT, "Years at School" FLOAT, "Overall Record" TEXT, "Record at School" TEXT, "ACC Record" TEXT)

How many values were used to express the years at school of the Maryland team?
SELECT COUNT("Years at School") FROM table_30724 WHERE "Team" = 'Maryland'
SELECT COUNT("Years at School") FROM "table_30724" WHERE "Team" = 'Maryland'