CREATE TABLE table_55183 ("Week" TEXT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Kickoff [a ]" TEXT, "Game site" TEXT, "Attendance" TEXT, "Record" TEXT)

What is the kickoff time for the Hubert H. Humphrey Metrodome?
SELECT "Kickoff [a ]" FROM table_55183 WHERE "Game site" = 'hubert h. humphrey metrodome'
SELECT "Kickoff [a ]" FROM "table_55183" WHERE "Game site" = 'hubert h. humphrey metrodome'