I think we're meant to make as many as we can, no set number. I doubt they have a quota on what you can do with your mind, Ser Jaime.

( When he mentions being a tutor for magic needlework, Sansa laughs softly and puts her hand on his forearm briefly. She's no better at making webs than he but having a lighter Jewel does make it easier because she doesn't have so much raw power to control. )

I don't know that I will be the best tutor but I will give it a good try, I promise.