When you divide 7 into any number that is not a multiple of 7, the repeat of digits will be 6 units long. The number of digits in the repeat must be less than the denominator. 7 is the lowest denominator where the repeats are all the maximum length.
1/7 = 0.142857 (repeating)
2/7 = 0.285714 (repeating)
3/7 = 0.428571 (repeating)
4/7 = 0.571428 (repeating)
5/7 = 0.714285 (repeating)
6/7 = 0.857142 (repeating)
Notice that all of these are the SAME CYCLE of numbers, in the same order, they just start in a different place.
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