I would recommend you sitting down with your manager and defining metrics of success for your job. "If I get this X done then Y is was I am being evaluated on."

I would recommend you sitting down with your manager and defining metrics of success for your job. "If I get this X done then Y is was I am being evaluated on." By doing this you can essentially cut down your work hours significantly. You can make the case that as long as your work is being done and your method of evaluation is progressing upward then there is no reason you can't work flex hours. This goes industry to industry but I worked at a large tech company and had success in that.