Question: how many miles per week to run a sub 3 hour marathon?
Answer: A 3:00 marathon is approximately 6:50 per mile. To break 3:00, you should eventually be capable of a sub-1:25 half-marathon (6:30 per mile) and sub-38:00 10K (6:00 per mile) Right now, you should be running at least 35-40 miles per week, over six or seven sessions.