Max value between every nth cell - blocks of data

[sans]

Hello,

I am trying to find a way to get the max value between every nth cell. In the "Data" sheet you can see the blocks of results (in reality they are more than a hundred) which are spaced out every 3 columns. You can see the max value in the sheet named "Max". I tried to adapt various formulas I found on the forum but didn't manage to get it right.

Basically in the attachment, you can see a MAX(D7,A7,AAP7) formula pulled down, which will take a lot of time to complete. Can this be done faster with a formula or vba?

Thank you