In an ideal doubling ledger, twice the start reaches the same threshold one cycle earlier. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Twice the start reaches one cycle earlier
Start with 6 copies. The same threshold 24 is reached at cycle 2.
6,12,24
The one-cycle shift is exact in this toy model
The first row reached threshold at cycle 3. This row reaches at cycle 2, one cycle earlier.