I am new to trade usa stocks. If I dont use level2, but use normal online trading, How many sec is necessary for my limit order to reach the market? If order from level2 platform, its cost more expensive ,and charged ECN too. So better way is to use level2 for checking market data only, and order from webbased online account is better. But how different spped for order to reach market is it from level2 platform or from webbased platform?