Hey there!
I would say that you should go over them within the least amount of time as possible. The amount that someone remembers after a lecture or informative session goes down greatly after only a few hours since the lecture, so it's best to review them within 8 hours or so. If you do it within this time, you will still have the greatest possible remembrance of what you learned, since your memory of this continues to diminish over the next few days.
Hope this helped you out! :-)
