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Jewel-Osco, Walmart and Trader Joe’s are among the chains that are shortening their hours so they can clean and restock as shoppers flock to stores amid coronavirus concerns.

Jewel-Osco, the largest grocery chain in the Chicago area, said Sunday it is temporarily adjusting hours at some of its 24-hour stores, effective immediately. Customers should reach out to their individual stores to find out their new hours, said spokeswoman Mary Frances Trucco. Pharmacy hours will remain the same.

Walmart, the world's largest retailer, is trimming hours at its 24-hour stores, which as of Sunday have hours of 6 a.m. to 11 p.m. Some other stores also will have reduced hours.

Trader Joe’s will open an hour later and close two hours earlier than usual, starting Monday. Its new hours are 9 a.m. to 7 p.m., according to stores associates reached at several Chicago stores.

Other chains, including Walgreens, Target, Mariano’s and Pete’s Fresh Market, say they are not changing their hours.