Right you are ninth, I was wrong (now who needs a whack on the head
Here's a copy paste of part of the answer I recieved from support:
>> We have scheduled this time in synchronization with eBay and after conducting studies that shows that is when our site receives the least traffic and, therefore, impacts the fewest customers. We also have many customers in the United Kingdom and Australia and they are taken into consideration as well.
Listings that are scheduled to post during that period are going to fail as, we loose connectivity with eBay servers <<