You didn't give us a link to the pattern, or how many sts you were starting with, so going by what you did post, that's how I interpret it. After the 'every 4th row 5 times' then you start the 'every row 4 times' (which I missed initially) on the next row.You would be decreasing a total of 24 sts.
Dec 1 st each side on next row, then every other row twice more - that's 6 sts less
every 4th row 5 times - that's 10 sts less
every row 4 times - 8 sts less