=SUM(B3:INDEX(B:B,MAX(ROW($A$3),COUNT(B$3:B3)-Home!$C$3/15+ROW($A$3))))
The formulas in Col J:Q determine the number of blocks that need summing i.e 6 blocks for 90, 7 for 105, 8 for 120 and so on. This is in the "time data" sheet.
I am having an hard time understanding this formula in this model.
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