that you won't find out if you didn't get matched, but if you do get matched, you can get quickly matched or it can take a while. I actually got a message just two weeks before the last list came out that the batch I had selected from the previous list was available. I don't know why it took so long. I know there is a process of working down the list. So, if someone is offered a batch and thinks about it for a week or so and then decides not to take them, it could take a while to work down the list.
In the end, I passed on my batch, but I know someone else reserved them just a few days later when she was offered them.