Does it mean that you have been assigned too much work to finish in 8 hours, and if you don't finish the work you'll be fired? If so, that sounds like you are overworked and exploited.
Does it mean that all of your competitors are also working 12 hours days, so in the fight-to-the-bottom a single company can't reduce the work hours without fear the competition will overtake them? If so, then a law which requires 8 hours, or 6 hours, will get rid of that competition.
Are any of your competitors from countries which mandate an 8 hour work day? The US exempts programmers from that requirement, as I recall. If so, how do they manage?