I don't have a number for you, but I do know that it's a multiplier that gets applied before the cap from the ratio between the teacher and student scholarship skill. I suspect this means that in certain situations it could mean a lot and in others it could mean little based on the relative scholarship skills.

https://elanthipedia.play.net/mediawiki/index.php/Post:Teaching_Updates_-_04/08/2015_-_19:44

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