Prince Philip's time in hospital will extend through the weekend.

According to The Sun, his stay will continue for at least "several more days." The Duke of Edinburgh, 99, is resting in a bed at the King Edward VII Hospital in London, where he's not permitted to have any royal visitors at this time. The no visitors policy is following national health guidelines amid COVID-19, though the Duke's admission is not due to the disease.

Prince Philip "unwell" with non-COVID illness

Prince Philip was admitted to hospital on Tuesday, at which time Buckingham Palace stated: "The Duke's admission is a precautionary measure, on the advice of His Royal Highness's Doctor, after feeling unwell. The Duke is expected to remain in the hospital for a few days of observation and rest."

Friday night will be his fourth night spent at the King Edward VII Hospital, where he has been treated for issues in past years. Philip's current stay is unrelated to the coronavirus or the first dose of the vaccine he received last month.

Prince Philip: Visitors only "under exceptional circumstances"

The Sun also reported a statement from a hospital spokesperson, who said, "Visitors are not allowed apart from exceptional circumstances." Commentators believe this is a "good sign" for the Duke, as his case has so far been called only "precautionary" and is not in "exceptional" territory.

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Prince Philip to remain at the King Edward VII Hospital in London this weekend.

Away from the hospital, the Royal Family has moved forward with business as usual. The Queen and Prince Charles have kept up with engagements, while the Palace and Prince Harry and Duchess Meghan today released statements on the couple's permanent resignation from royal duties.