Definitely impressive, but certainly not delivered within 48 hours. I’m based in Shanghai and use Taobao/Tmall on a near-daily basis. There was a noticeable slowdown in order for at least a week or two on either side of the holiday. For regular items, if you order it right before the holiday, you may not get it for a couple of weeks in some cases.

Doesn’t take anything away from what Alibaba is doing. It’s a huge spike over their normal business operations. I would be surprised if it didn’t cause a disruption of some sort.