it can vary...this weekend it started narrowing 15:00-15:15 (est) and will return usually at 20:00 (est) Sunday You can look here for last weekend: (est times) http://fxtrade.oanda.com/resources/spreadstats/spreadsminmax.shtml
Well its been the same...but just keep in mind that its possible for them to change it....AND IT WILL HAPPEN SOMEDAY. Probably the day when I try to trade it!