Project duration closes only after instrument count and runs per day produce an exact daily readout budget. Exact arithmetic here means exact results for the stated model inputs; measured inputs still carry uncertainty and significant-figure limits.
highlighted = computed this step
Daily output sets days
The target is fixed. The scan changes instrument count and runs per day, then checks bases per day before dividing into days.
Nday=Ni⋅Nr⋅Nrun
More instruments and more runs shorten the schedule
The target column stays fixed. Each row first computes the daily physical readout, then divides the target by that daily amount.