Hours of the day

It is by pure chance that earth is settled into a 24 hour day. I wonder, what will happen, if a day is 12 hours instead. Will we all become spoilt brat who can only have attention span of 4 hours or will we just evolve a faster basic motor function/brain functions in exchange for the higher mental thinking. Not that we really need all that higher mental function…. Look at all the fucked up people around us. It makes me wonder if they even have a higher mental function.

Taking that argument further. Assuming that the transmission rate of neurons is going to be the same since that's the only biological existence we know, it is then wiser, to have specialization and class seperation in the society, to seperate the workers from the thinkiners in order to cope with the shortened day hours and have them born with different genetic code to perform different functions… borg.