What time black Friday finish?

Start: 4am

End:It's all day

Technically Black Friday Sales start as early as Monday, November 19, 2012. However, actually Black Friday (November 23rd this year) starts at 12:00 AM at select retailers in-stores and online.

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To add: Here in MN Walmarts were open all day, AND at 8 pm rolled out their first section of sales. Then at mid-night another, and 6 am another set.

Kmart has their start on Thursday, Thanksgiving, and then another set of good sales on Friday, and yet another on Saturday.

So, it can be what ever the store and staff do.