Maybe he gets his stamina from those early Hamburg club days with the Beatles, like the 48 nights they played (in a row!) over a contracted 2-month residency in 1960:
"They were expected to perform for four and a half hours each weekday night, from 8-9.30pm, 10-11pm, 11.30pm-12.30am and 1-2am.
"They also had to play for six hours on Saturdays, from 7-8.30pm, 9-10pm, 10.30-11.30pm,
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