At that 75k loan, 8% interest, and 100k salary, if you pay 10% of your salary it takes you 11.5 years to pay off (and you pay almost 40k in interest >50% of principal).
Same numbers, but a 100k loan that goes to 20.25 years to pay off and you pay >100k in interest.
Though to be fair, if we put in the average student loan ($29800) and the average US household income (60309) we bring it down to 6.33 years and ~8k in interest (28% of principal). But it is unlikely that many college graduates are making the median household income as a fresh graduate. If we go to 40k/yr salary then it jumps to 11.5 years and 15k in interest (53%).
This also doesn't take into account that most of these loans are variable interest rates. Considering that, these numbers would put us on the lower side (of someone starting with an 8% interest rate).
Edit: spelling
[0] https://www.bankrate.com/loans/student-loans/how-long-to-pay...