From the O-ladies i've spoken with, their average monthly salary falls between ¥170,000-190,000 depending on their company. One example I am familiar with are the full-time branch-school Managers who work for AEON (95% of which are predominantly female btw) and make less than ¥210,000 (much less than a fresh-off-the boat native speaker btw but higher than their typical OL counterparts).