On Weekdays most of the stores best buy opening time is 10 AM and best buy closing time is 9 PM. So on Monday to Friday stores usually open at 10 AM and closes at 9 PM. best buy black friday hours is 10 AM to 9 PM. best buy sunday hours is that it opens 1 hour late at 11 Pm and closes 1 hour early at 8 PM. On Saturday stores are open from 10 AM but closes 2 hour early at 7 PM. Best Buy Holiday Hours.