Jackk> he is functioning with complete competence 24 hours a day as President.
24 hour is a poetic license – except morning, late afternoons, and weekends. For exampe, during some Congress flare-up, Sen Manchin got offended by something coming out of WH on Friday and then discussed the problems “with the WH” (sic!) who continued sending bad messages, until Mr Biden showed up himself on Monday and they had a discussion that calmed things down. So, the President was not available even for a phone call over whole weekend.