10-8pm for some stores. I do know for a fact that the BAM! at The Legends in Kansas City, KS is open from 9am to 11pm on Saturday
Books-A-Million is open 8 AM to Midnight December 4-23. They close at 5 on Christmas Eve and at 9 on New Years Eve and New Years Day.
10am - 9pm
8 am - 10pm
2 in the afternoon