I just completed my first Half Marathon. I did so well in it that I decided my next goal is a full marathon. I downloaded an 18 week program off the internet and am ready to go. The only thing is the marathon I want to do isn't until October. How much should I run each week (days and miles) until I am 18 weeks out so that I can keep my endurance?
I am in a similar situation. Just completed my first half marathon in Nashville on the 26th. 2 days later I was signed up for the full Twin Cities Marathon in October. And like you, Im doing an 18 week training program. So what am I doing for the next few weeks? Well, my long run this week is going to be 5 miles and then next weekend Im doing a 10k (6.2 Miles). That race is a little bit different as in half of the course is off road on some grassy walking trails. So a bit of cross country running with a natural 5k. Should be fun, but yet keep my miles up there for week 1 of the program.