You can also shorten 25 / 75 * 60 * 2 * 5 * 52 / 60 / 24 = 7.22
to 25 / 75 * 2 * 5 * 52 / 24 = 7.22
and still get the same answer. I just used the 60's to keep track of the conversion to minutes and back, when creating the formula. But once you have it down, they are redundant.
And why is there a 30 minute editing limit?
I like to refine my posts... and some times it takes longer than that (due to trouble in my thought process vs communication process...)