Amazon quickly fulfilling orders on busy Cyber Monday

TRACY, Calif. (KGO) -- Today is Cyber Monday and experts say it's expected to top the previous four days in sales combined.

However, the recent trend continues of shoppers spreading out their clicking and buying over more days.

RELATED: Here's your shopping guide to Cyber Monday, Cyber Week deals

The Amazon Fulfillment Center in Tracy is humming right along, although executives say the high demand is no longer limited to a day.

"It's really become more of a deal season. It's not just Cyber Monday, although Cyber Monday is still our busiest day of the year. There's also Black Friday, a lot of shopping on Thanksgiving, and really all through the holiday season," Amazon spokesperson Lori Richter said.

Shoppers don't want to wait until Monday anymore to return to their office computer and its fast internet service. They're more mobile than ever and internet companies like Amazon are responding.

"You don't have to be tied down to your computer. Using the Amazon app, you can actually look at all the upcoming deals for the next 24 hours and mark which ones you want to watch," Richter said.

They know you expect deliveries quicker too. That's where robots come in.

The robots bring the product to an employee for packing.

Not all Amazon centers have them - the ones that rely on people take much longer to ship products.

"When a customer presses buy to the time that we're getting item off the shelf, we're still really fast but it's a matter of couple hours. In this building, we've taken that time down to a few minutes," VP of Global Communications Craig Berman said.

This is great on Cyber Monday. Last year on this day, Amazon got more than 54 million orders worldwide.

"That's 629 items per second last year, if you can imagine what this year might be, it's pretty compelling," he said.

They believe today will be busier than last year. In Northern California, there are more than 3,500 extra employees on hand to help them with this busy season.