On the home page this is shown as running: "*Bonanza marbles will be on sale from Tuesday, 10 November, 2015 to Thursday 10 December."
On the announcement page itself it says: "Marble sales period: Tuesday, 10 November, 2015 at 7:00 a.m. (GMT) to Thursday, 12 November at 8:00 a.m. (GMT)"
I seems self-evident the second one is incorrect.