A PCR chip cycle is a checked sequence of thermal control windows. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
A cycle is staged time
The staged control windows fill one cycle of 10 s.
tcycle=10s
Cycle time repeats
For 6 cycles, the program time is 60 s. This is thermal scheduling, not reaction kinetics.