That is up to Brightroom more than Disney but it is usually a while. I know that in the past I get a couple of emails reminding me I can still buy pictures along with an email that states something like this is your last chance to buy pictures from <insert race here>. You might get some discounts closer to the holidays if you are patient.
As for the surveys, definitely fill them out. Many of the complaints voiced here after the inaugural W&D half were corrected for the second race and those surveys probably had a lot to do with it.
I just went in and looked at the results and the weather must have really hurt the times for even the winners. I ran a 1:02:17 10-miler this spring at a local race and that was only good enough for 20th overall. That time would have been top 5 for this race but it doesn't sound like I'd be able to replicate that with how hot it was. That race this spring was run in 40-something degree temps which is perfect racing weather. It just goes to show how much the heat and humidity can be a factor so those of you who didn't do as well as you thought you would or wanted to keep that in mind. Some days the weather just doesn't let you have a good race no matter how prepared you are.