It's a highly subjective question. There are a few factors that impact this amount, in particular your style, your travel preferences, any school related trips, and if you doing study abroad or any kind of exchange program. It only takes into consideration Fun travel and excludes things such as internship search, interviews, and MBA fair travel.
Also if the country you were studying in is not your native country, for example you're from US and you're going to study in England, you're much more likely to travel a lot more and have a lot higher budget then somebody from San Francisco going to school in Los Angeles.
Now that I got the disclaimer out-of-the-way, I would say budget as much as you can. Traveling during school is probably the best time you will have to travel and keep your mind off the school related stress.it also takes advantage of being without a job or a vacation limit. You will also have a large number of like-minded individuals happy to travel with you and making the whole experience a lot more rich, interesting, and fun. Many groups set out on various trips throughout the year (though mostly on breaks and holidays) to do something fun and I wish I had more money during bschool to join more of them.
After you graduate, your emphasis will be on getting a job making enough money to pay your loans replacing your outdated wardrobe, getting a new car, relocating, getting a new apartment or a house. You will also be working your butt off in the new job trying to establish yourself. You will most likely meet somebody have kids with them and so on it goes. Make no mistake – this is your last chance to travel and enjoy it. Do it while you can.
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