In the book “Run Faster” by Brad Hudson, he listed an appropriate average weekly running volume (in miles) target for 5 Levels of Runner at 4 Race Distances.

For “Beginners“—runners with less than a year of consistent running, the following are the suggested weekly mileage:

5K————-20-30 miles

10K————25-35 miles

Half-Marathon—35-40 miles

Marathon——-40-50 miles

For “Low-Key Competitive” runners—these are runners who care about improving their race times, but are either unable or unwilling to devote a lot of time and energy to training, the ff are the suggested weekly mleage:

5K————-25-35 miles

10K————30-40 miles

Half-Marathon—35-45 miles

Marathon——-50-60 miles

For “Competitive” runners—these are runners who have at least a couple of years of hard training in their legs and are determined to improve further, but not at the cost of having to run more than six or seven times a week, the ff are the suggested weekly mileage:

5K————-40-50 miles

10K————45-55 miles

Half-Marathon—50-60 miles

Marathon——-60-70 miles

For “Highly Competitive” runners—these are runners who wish they could train like elite runners, but simply cannot, the ff are the suggested weekly mileage:

5K————50-60 miles

10K———–60-70 miles

Half-Marathon—70-80 miles

Marathon——-80-90 miles

For “Elite” runners, the ff are the suggested weekly mileage:

5K————90-110 miles

10K———–95-115K miles

Half-Marathon—100-120 miles

Marathon——–110-130 miles

Reference: “Run Faster” by Brad Hudson, page 56