Sorry Mary just saw your post. I think 6 central is 4 pacific? All challenges this season so far have been at 6:30 central or after, so I am confused by this comment? lol
There's a schedule thread on the Welcome Area of the forum so you can check what time the challenges are for the rest of the week. Sometimes, like today, I may need to postpone or cancel a challenge but you guys will know well in advance when this happens and I post on IMDb too in case you dont check the forum. I didnt post there today because it wasnt a cancellation like last time.
TL;DR version: all challenges so far have been hosted at 6:30 Central or After.