Hey you!! Welcome back!

Sounds like you are doing marvelously - aside from the foot surgery. Yikes. Well, good for you for setting a post recovery goal. I find having a goal like that the only way to really motivate myself, especially coming back from injury/illness (I sure do know what that's like. )

Anyway, if you can get yourself to a 75 - 80 mile ride about 2 - 3 weeks before your target event, then you will be fine. Just work your way up, adding 5 - 10 miles every week or two and you're there. Be sure to take a recovery week where you're doing less mileage and/or lower intensity every month. And make sure you keep it fun and not a chore.

Looking forward to hearing more about you and John and everything! (I found you on FB).