Posted: 06/06/2016 at 21:11
you've not got much time. I'm a little worried you may not have time to build up to 13.1 miles in 3 weeks. The difficulty is, if you over train, you may end up with an injury.
If I were you I would plan to run/walk round the half marathon , if you are intent on doing it. Don't worry about the time...that's all relative anyway. You're not hoping to come first, so the rest doesn't matter.
have you got 3 Sunday's before the race or 4?
if you have 3, I would risk the following for your long runs.
this Sunday: run/walk 9 miles
next Sunday: run 7 miles
3rd Sunday: race day run/walk.
there are many run/walk plans. Some where you run for 4 min, walk for 1 min or something similar. A run/walk plan allows you to cover more of a distance without getting too tired.