Did anyone sign up for package at Baby spa. Was it worth it? How long is the swimming for?

when my boy was 3 months old, we signed him up for the unlimited package. he swims twice a week and we limit the time for his swims to not more than 20mins to prevent him from being overtired, and to be able to reach home in time for his nap :) IMO, it helps my boy in his motor skills development and surprisingly, he learnt how to propel himself forward and backward, and turn around on his own without any intervention.