I have entered my first marathon which falls 9 weeks prior to my first Half Ironman triathlon. Both events will be my first endurance races as, despite being a lifelong runner, I have only done a sprinkling of events ranging from sprint triathlons to a half marathon. I have about 7 weeks before I start a 20 week marathon training plan but am unsure how to allocate my time now. I want to build a decent running/cycling base and work on swim technique, but what is the best way to allocate my time usefully both in the period up to my marathon training and during my marathon training? Should it be the 20:50:30 approach or will this not get me marathon-schedule-ready-enough with such little time on my feet in the approach?
Any advice much appreciated.