I think the best time is when we think that market trends benefit us and we can trade profitably. Besides this I don't think that there are some hard and fast rules and times to trade and we have a certain time where we can trading all i can say is that once we can take a lot of time to analyze the market direction and get a better indicator then we can always trade all day long as our requirements are met, but i think i would advise all traders to get confirmation before trading