Shaping sleeve

I have a question about my pattern.Where it says then ,bind off 2sts at each side until the piece measures 55cm, do I keep binding off 2sts each side for how many rows it takes to get to 55cm or do I do it once? Here is my pattern

When sleeve measures 49-49-47-47-45 cm bind off for sleeve cap at each side every other row: 4 sts 1 time, 3 sts 1 time, 2 sts 3 times, 1 st 0-0-4-5-8 times,( then bind off 2 sts at each side until the piece measures 55-56-56-57-57 cm) and then bind off 3 sts 1 time. The piece measures approx. 56-57-57-58-58 cm, bind off the remaining sts.

Keep binding 2 sts at both ends of every other row until it is 55cm long, however many rows it takes.

Thank, now I can keep going. :cheering: