There are many time frames that repeat but two I see many times is 56/112 weeks and 65 weeks.
I find the 65 interesting as it is also a ma I like but is 1.25 years or 1/8th (Gann) of a decade.
56 weeks is close to 1/8th of an Armstrong cycle (8.6 years) or 392/3 cal days or just a few days less than 13 months.
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