Ignoring the fact that this time constraints this is a piss poor excuse for not doing both. HTFU
Do the long ride (make 70min into 60min) and pick a segment of it (assume you've done it before?) to smash 10mi of. You won't be as fast as with a number on your back but refer to HTFU for that. You get the benefits of a decent ride AND some intensity. None of this driving fanny. None of this pootling over hillocks.
Pfft.. ladies ladies ladies...
Ignoring the fact that this time constraints this is a piss poor excuse for not doing both. HTFU
Do the long ride (make 70min into 60min) and pick a segment of it (assume you've done it before?) to smash 10mi of. You won't be as fast as with a number on your back but refer to HTFU for that. You get the benefits of a decent ride AND some intensity. None of this driving fanny. None of this pootling over hillocks.
Go forth and Smash It™.