I know you did get in, but for other readers, the spinning wheel means your browser is trying, but is not able to connect to the link.
This can happen on other sites too; it sometimes means the site you are trying to get to is too busy to connect to, could be an issue with your or the site's internet connection or your browser. It
might eventually connect, but usually will just time out and exit the page.
You are not actually connected to chat when you see the spinning wheel
When it's not busy, the CMs doing
DAS Advance Selections are often only working with one guest at a time. When it's busy, they do work with more than one.
It makes sense from their standpoint because they can be looking for selections for one guest at the same time as a second guest is typing their selections into the secure form.
Some might go much faster than others because the guests are ready with their 3 top choices for each park. Some might be more time consuming because of reservations or attraction choices or times that are higher demand