gamergirl675: how long is long enough to wait?
I would say at least 5 business days, something you have clearly not done.
gamergirl675: I belong to several game sites.
And how many of those sites require you to be a member before you make a purchase?
gamergirl675: But this was frustrating and completly avoidable.
Yes, you're right here. You could have taken the time to read up about making purchases and avoided the whole situation. While GOG are partially to blame here in that they did not clearly state the end time well enough for those who didn't take the time to look around the site, you are also partially to blame in failing to have read up on how the site operates. Something, you'd expect someone who claims to use several gaming sites to make gaming purchases, to understand already.
gamergirl675: And make no mistake. I am a customer. I became a customer the moment I hit the site.
No. You are a potential customer. You are not an actual customer until after you have fully completed a transaction.