SLEEVE:
...AT THE SAME TIME inc 1 dc in each side on every row a total of 13-14-16-17 times..

Correction - 7 ROUND: When repeating from *-* the last time, do not work [2 dc, 2 ch, 2 dc] but work 1 sl st in the first of the ch sts in the middle of first corner at beg of round, cut and fasten the thread.