Clock period and sample count multiply into the covered sample window. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Four samples at two seconds cover eight
A clock period of 2 s across 4 sample cells covers 8 s.
4⋅2s=8s
Six samples at the same period cover twelve
A clock period of 2 s across 6 sample cells covers 12 s.
6⋅2s=12s
Halving the period halves the same-count window
A clock period of 1 s across 6 sample cells covers 6 s.