Is it better to have the day off of work for Friday prayers or just some time off of work?

Just wondering about this from a cross-cultural sensitivity sort of angle. Many Christians and Jews have a normal work-week in the USA with Saturday and Sundays off which coincides well with their religious observances. I've seen businesses make provisions for male Muslim coworkers who have Friday prayer times, but is it better, or would it be better, if the company would allow them to organize their entire week around Friday observances, or is a few hours for prayer sufficient?