Make sure you combine all the loans in to ONE, that will reduce the % you pay. Also, get the payments on a automatic withdrawal every month, that too will lower your % point.
I think I put my $20,000 out for 30 years. Ditto for my wife's.
Also, not be be morbid but do NOT combine those loans and do NOT pay them off early. First, the % you pay is as low as it gets. Any money you'd apply towards paying off student loans early should go towards a house, car, etc, payment. Secondly, if you die before the loan is paid off the debt is forgiven. No need to combine with your spouse and force her to carry it on (and vise-versa) due to an early death.
I was on the 7 year plane for the 4 year degree. I spent extra time in college writing papers on WWII, seriously. I enjoyed the 400+ level courses when there were only 3-4 of us in class.