I applied for a refund in 2006; I think it took a week or two. Keep in mind they just processed the September LSAT so it may take an extra few days. I'd wait until Friday and if you don't see the funds back on your CC or your account on LSAT affected give them a call, it's not like they're going to punish you for asking.
For what it's worth, I saw the refund on my credit card before I saw it on my LSAT account, and I definitely didn't get any kind of confirmation.