This is a 16 week, time based advanced level marathon training plan designed for someone trying to finish the 50 States, but still run a fast marathon time at a target race. There are two marathons contained in the plan, four weeks apart (mimicking race combinations such as the Des Moines Marathon and the New York City Marathon.) The first one will be treated like a long run and the second marathon is the target race. You should be comfortable running about 5 hours week prior to starting this plan, with at least one marathon completed. There are two - three speed workout days per week, with the long run and both marathons scheduled for Sundays. The weekly running hours top out at 8 hours per week but there is additional cross training scheduled with a rest day on Fridays weekly.