$100 per $10,000 owed for 10 years is a general rule.
University would have cost me $40,000 for the 4 years but I went to Community college and did it in 2.
So I would've owed $400/month instead of $200. It was actually a cheap school. Completely on loans with no parent help, $50,000 or so would be pretty normal.
With professional school its about $25,000 per year or so and your undergraduate loans pile on. So $50k + $100k = $150k in student loans is pretty typical for a lawyer, pharmacist, Phd, etc. That equates to about $1,500 per month over 10 years.
I'm sure you can refinance that which will save your ass, but you also end up paying quite a lot in interest if you finance over 20 years. It's almost like buying a house. So you had better make that $100k a year just to live like a normal person making $40-$50k. You'll be paying something like $1,500/month over 10 years or $750/month for 20 if you ever want to actually pay it off. Many people fail to actually make payments sufficient to pay off the loans. I know someone who went from $150k to $170k while still paying $1,000/month. Which if course, you'd need to pay $1,500 a month to actually start paying it off.