the turn off time zone is EST.
Most of the MT4 servers use GMT time zone but some others, like OANDA MT4 use EST. So, the turn off time zone should be the one used by your server. Another requirement of VF ROBOT is a minimum account balance of $1200 and whatever is the leverage of your account, make sure you got enough funds to buy or sell at least 0.6 lots.
Always insure steady growth