New York (CNN Business) Walmart, the largest retailer in America, is shortening its hours even further as the coronavirus pandemic -- and demand for necessities -- escalates.

Beginning Thursday, many of Walmart's 4,700 US stores will be open from 7 am to 8:30 pm until further notice. It's the second adjustment the retailer made to its hours within a week. Many Walmarts are typically open 24 hours, but some stores that previously opened after 7 am will maintain their regular hours.

The company said the shortened hours will "further help" employees restock shelves overnight and clean stores. Walmart is also temporarily shutting down its automotive centers. Employees who staffed automotive centers will now help stock and clean the rest of the store.

Walmart WMT Walmart is also introducing special shopping hours for people aged 60 and older.said it will open its stores to seniors only, one hour before the stores open every Tuesday from March 24 through April 28.

Target TGT Dollar General DG Other stores have recently announced similar hours for its older customers, including, Amazon-owned Whole Foods and

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