I did the Prudential Ride London 100 last year on a Specialized Sirrus Elite hybrid with 28 tyres on. I finished in 7 hours so your goal is easily achievable IMO, speaking as a relatively unfit middle aged guy.
(Edit to say 28mm tyres! I wasn't carrying 26 spare tyres with me, except round my middle)
(Edit to say 28mm tyres! I wasn't carrying 26 spare tyres with me, except round my middle)
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