There are lots of important things about Fridays: * The market closes at 4:00 pm NYT before Sunday afternoon 5:00 pm NYT * You generally do not wish to carry open positions into the weekend (unless you are prepared for the possible action - good or bad) coming into the new week. The majority of individuals don't have that crystal ball * You will have carry cost or interest possible * Friday afternoon's are slop because most trader's are considering other things There are more, but I expect you get the idea... If you want to exchange the London and...