CREATE TABLE table_204_11 (id DECIMAL, "year" DECIMAL, "fbs opponent" TEXT, "result" TEXT, "opponent's conference" TEXT, "opponent's head coach" TEXT, "charleston southern's head coach" TEXT)

how long was david dowd head coach ?
SELECT COUNT("year") FROM table_204_11 WHERE "charleston southern's head coach" = 'david dowd'
SELECT COUNT("year") FROM "table_204_11" WHERE "charleston southern's head coach" = 'david dowd'