New York (CNN Business) The coronavirus crisis is hurting America's retail industry, so many stores are shutting their doors or reducing their hours.

Walmart WMT , the largest retailer in America, said Saturday that it will modify its store hours in response to the pandemic, while other retailers plan to temporarily close stores.

Beginning Sunday, all of Walmart's more than 4,700 US stores will be open from 6 am to 11 pm until further notice. The company said the shortened hours will help employees restock shelves overnight and clean stores. Thousands of Walmart stores are already operating under shortened hours.

Walmart employees will keep their regular daytime or evening shifts, the company said.

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