Living on the east coast of the United States (outside Boston), I had a slim hope that my Casio Protrek PAW1300T-7V would ever receive a signal from Colorado. A night went by when I placed the watch on a South West windowsill to no avail. I read many forum posts online which mentioned the difficulty in syncing from the East Coast.
I checked the next day and saw that the atomic clock and my watch differed by less than 3 seconds. So I didn’t worry a lot about the sync. It was really close.
Last night I went to bed, making sure Auto Sync was turned on. It was. I went to sleep, being on the North East side of the house, where our bed is located in the master bedroom. I figured whatever, it doesn’t matter.
This morning I woke up and looked at the watch face – there were the three bars showing me a sync did indeed take place last night. I checked the R/C status and at 12:05 the sync happened. Wonderful! In the wrong corner of the house and wearing it (not facing a window)… and it worked.