I am happy with a 6hr ride 2 weeks out from an IM
Then a 3-4 hr ride the week before
Flat out in the fens used to fit with outlaw..... Not sure what the timing is this year....
They welcome tt bikes / full areo kit so go crank it there as a good bike session, even if its 2-4 weeks ahead.....
Outlaw is quite flat so hilly sportives are not that relevant.