I had a nice PR at my last 10k despite intense heat... I took Friday off (the race was on Saturday) - I might have ridden the bike, but definitely no running. To be honest, I sort of forgot the race was coming up and I was doing my normal routine, even ran a 15 miler the weekend before. So, the short answer is one or 2 days is probably sufficient!
"Success is not final, failure is not fatal; it is the courage to continue that counts" - Winston Churchill
2012 Running Mileage: 2,065