it depends on what you want the 'market' to be. is the market a place for price discovery or the market for investor to buy investments or is the market a 'game' where 99% of the volume is daytraders flipping and playing hot potatoes(shares). As for 24 hour. there is not enough demand to need to be opened 2 hours day a week if an investor wants to buy. the fact the more vollume the more money SEC makes and market makers in ripping off newbie retail traders who think the market is a fair and orderly market and the market is real. which it is not. it's not even casino where you have a fair chance of making big money like in slot machines or lotteries. or black jack or poker table. it won't effect investors of these companies who shares are traded and listed in the xchange. or have any effect on the companies finances. i guess if the exchange makes more money and sec makes more and market makers makes more money, go ahead who cares but the integrity of the market is at stake.