How long does it typically take for ETS to mail your GRE scores?

[lifeofbai]

I'm sure that this has been answered here before, but there are a lot of posts to wade through... How long does it typically take ETS to mail your GRE scores to schools? I have a January 15 deadline, and I'd like to give myself enough time to make sure the scores are sent and received by the university.

I'd appreciate any feedback.