Commuting 45mins-1hour is very doable, and is quite normal in the working world. Once you get past that hour mark it becomes a bit of a chore. If you are taking trains the mental toll is less than buses, as trains are generally more reliable (don't get stuck in traffic) and comfortable.
In terms of the whole student debt thing, it really depends on how much other debt you're going to rack up, and what maintenance loan you would be getting. The interest rates are quite high and will result in the debt growing quickly, so the amount you would have to pay back would increase. Many people pay back their original debt but only a portion of the added interest, so they essentially have a 9% tax for the next x amount of years. What you have to work out is how likely are you to clear the debt, if you are unlikely to clear it with interest growth, then take as much from student finance as they are willing to give you, as you will only ever pay back 9% of your income over x amount each year. If your other student finance debt is minimal (I would say like 20k-40k) then you are more likely to pay it off, and then potentially might want to limit your maintenance loan, but it's a gamble and depends on your financial circumstances. I suggest making a spreadsheet lol.