Really up to you, I live in North London so I have alot of opportunities surrounding me, with all that being said, I would really only travel 30 minutes to my place of work at most, but its also whether you can afford to make that journey whenever you are required to. If you're going to take it, I would say look at accommodation around the area, it may not bother you at first, but after a while, the journey will begin to take its toll.