Many sources have quoted Biden’s staff who say Biden worked from 10 to 4 then went to the WH Residence.
www.businessinsider.com/joe-biden-de...
Biden's aides said his debate performance was poor because he struggles to function after 4 p.m., report says
President Joe Biden's aides defended his poor debate performance, telling Axios he's more likely to make verbal mistakes and become tired after 4 p.m.