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I think that the amount of time your period can be delayed varies from person to person. There's not really a set time, but you are right that stress can be a huge factor in delaying your period, and it totally sucks.

I think the best thing you can do for yourself is to work on what is causing you such stress. I am sure we can give you more specific advice on how to handle certain issues if you ask about them, but besides that I would take time out for yourself every day! I know it can be hard to do that with a busy schedule, but remember that you are important too and you need to put yourself first sometimes. Even if it is just fifteen minutes to read a chapter of a book or listen to some calm music, it can go a long way. On the days when you have even more free time you can take a bubble bath and light some really nice candles!

If this becomes a regular issue for you you can also talk to your doctor about ways to manage it. It may be birth control to regulate the period, or your doctor may have ways to help manage stress.

Best of luck!

-Dez