You have picked some exotic marathons! Do keep your plans and run all four events this year. Your second event is 3 months from your first. Your third is 2 months from your second. Your fourth is one month from your third. These spans will give you adequate time to recover.
Mike Wardian in my area (Washington, DC) ran two local marathons this spring with a one week span, and won both!
The closer your marathons are to each other, the more important I think it is that you stay active. Don't take time off from your training. Instead, go out running or walking as soon as possible after each marathon. The next day, for example. The first walk or run after a marathon can be as slow as you want. Then continue to take walks or runs at your normal frequency (say, 3 to 6 times per week). Make each walk or run a little faster than the last, until you have regained the speed you had prior to your most recent marathon. Then resume your marathon training program (speed and endurance work, plus a taper). The important aspect of your speedy recovery from each event is to keep your legs at least moderately active. (I'll be following this recovery plan myself this fall.)
Wish I had your exotic experiences!
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