It takes up to and including the last cell in BC3:BZ3 containing a number. You can change BZ3 to a higher address if needed.
Please note that the formulas in BC1:BZ1 are array formulas. An array formula must be entered by holding down Ctrl and Shift before pressing Enter where you normally just press Enter. If you do it correct Excel will automatically put braces {} around the formula. When you have entered one array formula correctly you can copy it to other cells in the normal way.
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