Training Start time

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For those of you who follow (more or less) Friel's periodization model, when do you typically start Base 1? I was thinking i would have three Bases (i.e.- Base 1, Base 2, Base 3) and three Build's (i.e.- Build 1, Build 2, Build 3). Each Build/Base period is 4 weeks long. My goal event is a TT in the second week of September (the day is unknown). Tell me your experiences