like 5 days a week probably.
MONDAY: 10 mi AM easy/PM easy + strides
TUESDAY: 11 mi AM workout/PM easy + strength
WEDNESDAY: 12 mi midweek
THURSDAY: 10 mi AM recovery/PM recovery/xtrain/OFF + strides
FRIDAY: 11 mi AM workout/PM easy + strength
SATURDAY: 10 mi AM easy/PM easy
SUNDAY: 16 mi long run
Start at a base mileage you feel comfortable at and build up at a rate you feel comfortable doing. Down week every 4th week, then continue building from the peak you reached. At around 65 MPW, start to incorporate doubles, up to 5 days a week. You can do singles if you need to, but if you have the time I highly recommend doing doubles. Continue building using the build-build-build-down model until you hit 80, then hold there for 3, down 1, adjusting as need be. Don't need to hit 80 every week but make sure that's the goal.
You can split it up however you want, work out Tuesdays and Fridays, recover Thursday, Monday, or Saturday. Cross train on recovery days if you want or take off if you're too dead. Down week every 4th week or during a race week.
If not working out, still split it up the same, make sure one double is longer than the other unless you want to split them up evenly, that's your call.