GRE score sending how long

This question is similar to this one but is different enough I felt I should ask it separately.

I am wondering how long it will take a given institution to receive my General GRE scores from ETS. Note: I am not asking how long it will take after I take a test for the scores to be sent. These are scores from a test I took almost two years ago; I am asking how long it will take for scores already available to be sent and available.

If it matters, I am putting my score submission request into ETS on Jan. 2. I don't know if some times of the year are busier for them than others and thus processing and sending times may vary.