I want email disneyland Paris to ask them about birthdays and dreams continuing until October 31st 2014 how quickly will get an reply form them.
Just a little correction to your post, Disney Dreams! is, at the moment, continuing until the end of September not the end of October.
To answer your question, I don't really know, give around 3-5 working days.
You can call them. I never got in contact via email.