They usually seem to pay once a month, around the middle. I got my Paypal payment yesterday (the 15th) for 2 shops I did in January. HTH
I enjoy working for IPSOS and have continued to work with them. In general, they pay accurately and on time. I say in general because I have a few shops that have been left in HOLD limbo for years that should have received go-to fees, and a few other shops that the scheduler completely removed from my list rather than give the go-to fee. On the whole, I find working with them pleasant and professional.