[MrDosu]

I have worked on a noon to midnight in office schedule for long periods of time and noticed most people sharing the office with you take it psychologically as noon to five even when you are actually in office 50% longer than them.

[magic_beans]

If your manager is fine with it, who cares what other people think?

[theandrewbailey]

What people think can cause misconceptions, which can give you hostile co-workers and negative opinions.

[MrDosu]

There was no manager above at that point. I loved to do it because it was super efficient for me. You get into the office when some problems had already came up and people already had tried a bit of effort to solve them themselves. Then you just do rounds after lunch and fix them. Then after people went home it was a good time to review code and catch up on the personal work.

[pc86]

Nobody, until someone gets promoted and now there's a manager (maybe even your manager) who has a negative opinion of you.

[knightofmars]

This is office politics. If employee value to a company isn't immediately identifiable and measurable outside of "hours with butt in chair" then said company is incapable of properly valuing its employees (the exception being a company that just wants to bill hours for a "butt in a chair"). It means the entire process is based entirely on individual perception. This leads to its own set of problems where individuals game the system to be perceived as harder working but in reality may actually be doing less work or a larger amount of trivial "busy" work. This is a failure and will only lead to a culture of resentment and game playing within the company.