Marathon Training
Long 2 to 3 hours or start from your longest run now and add 15 minutes a week working up to 3.0 hours max in duration. Pace should be around 2 minutes slower than your 10K time.Base the run on the total time, not distance.
Hills 45 to 60 minutes. Alternate workouts. Try fast pace up hill, then slow down hill; or progressively faster but shorter repeats; or every other lap fast; or add hills to your long run.
Tempo 30 to 45 minutes at a pace that is about 10 to 15 seconds faster than your average marathon goal per minute time.
Intervals 30 to 60 minutes. Do mile repeats at a pace about 20 to 25 seconds faster than your average marathon pace. Gradually increase the number. See the Mile Repeat Table below for number and pace
Marathon Pace 45 minutes to 1.5 hours. Run at your targeted average marathon pace. Begin with shorter runs. Base your time on your heart rate. Try to keep it below 80-28% of max. If it goes above 85% stop or slow down.
Easy 30 to 60 minutes. Aerobic pace or slower. Enjoy the scenery.
Cross Train Run only 3 to 4 times a week - 5 max. Bike, swim, workout or rest on off days.
Notes This schedule assumes that you have a good base and could do a 2.5 to 3.0 hours long run. You only need to do run three to five per week, but make sure you get in your long run and at least one quality run. High mileage is not crucial. If you do more runs, decrease the mileage per run. Mix hard days and easy days. Do not do back to back hard runs. Always warm up first for 10 to 15 minutes and cool down afterwards.
Every 3 to four weeks reduce your volume for a week, then test your progress with either a 5 to 10 K race or you can do the following test:
Run 8 to 12 - 800 meter repeats as fast as you can with a 20 second walk in between. Your average lap time should improve. And it can be a direct indication of your potential marathon time. An average lap time of 3 minutes 20 seconds indicates a marathon time of 3 hours and 20 minutes

Week Long Strength Speed Easy
1 2 hr long run 1 hr tempo run      1 hr hill repeats 4 miles
2 2:15 hr long run 1 hr tempo run      1 hr hill repeats 4 miles
3 2:30 hr long run 1 hr tempo run 1 mile intervals (1 to 2) 5 miles
4 1:30 hr long run 0:5 hr marathon pace run  1 mile intervals (2 to 3) 6 miles
5 2:45 hr long run  w/hills 1 hr hill repeats Good week for a 10K race 6 miles
6 3:00 hr long run  w/tempo finish 1 hr tempo run 1 mile intervals (3 to 4) 6 miles
7 2:30 hr long run  w/hills 1hr marathon pace run   1 mile intervals (4 to 5) 6 miles
8 3:00 hr long run  w/tempo finish 1 hr tempo run 1 mile intervals (5 to 6) 6 miles
9 3:00  hr long run  w/hills 1 hr hill repeats Good week for a 10K race 6 miles
10 2:15 hr long run  w/tempo finish 1 hr marathon pace run  1 mile intervals (3 to 4) 6 miles
11 2:00 hr long run 1 hr marathon pace run  1 mile intervals (4 to 5) 6 miles
12 1:00 hr long run 0.5 hr marathon pace run  Race 4 miles