Wow he's basing her off that other woman who took 8 years for the 4 year degree. So there's your answer. No matter what he'll have an excuse. She was busy. She tried hard. She is finding herself. She wasn't cut out for that. She'll find another perfect thing and then thrive.

So on and so forth for decades 

8yrs?  His coworker is a light weight regarding slacking on college gradaution. I was on the 11yr plan myself.  I was in class, every semester, for 11yrs. Not always full time. But, I was in class.  When I completed my BS I had almost 240 semester hours of credit on my transcripts.  11yrs, 7 schools, 7 different majors. One degree.  Lets just say I was easily distracted.

Some mitigating information on that may be that I started a company, ran it for 6yrs, got married, got divorced, etc.....

Mainly, I just like school and would change my major when I took an elective that piqued by interest.

Like your DH, my SIL (DW's sister) has no clue how College/University works. Though SIL actually attended two universities for a decade+ and accomplished absolutely nothing by that effort. She does not understand much at all about how college/university works.  She was one of the social promotion kids all through K-12.  She drinks the IL clan Kool-Aid that all of the teachers and administrators were idiots, she knew more than they all did, etc..  She still stands on that level of ignorance with her never ending string of employers.

Then accountability smacked her in the face.  Her first year of University was at DW's alma mater, DW worked with her primary professor/mentor to get SIL in.  Then we rode her like a cheap pony to not skip class, do her work, write, rewrite, and rewrite again any written assignments so that she was actually turning in college level work rather than semiliterate blather at a low elementary school level.  SIL is actually very accomplished in mathmatics but is barely functional at a literacy level. Though she is orders of magnitude better than she was when she moved in with us and we paid for her Freshman year of Uni.  After her first year (she had a solid B average) she ran back to SpermLand and transferred to a local small university where she borrowed a shit ton of money, failed more classes than she passed, never re-took a class she failed, got all butt  hurt when they rejected her entry into the school of education, then eventually was not allowed to borrow any more school loan money, got no more grants, and was not allowed to register for any more classes.

She is still mystified at how mean the University is to her, how her professors were mean, how she took more than enough classes to graduate, gives a bug eyed confused look when it is pointed out that unlike K-12, she actually has to pass her classes at the college level to get credit and graduate.  This is not a kidult in their early to mid 20s. This is a 37yo.

It took me 10 years to get my degree but I was a "mature" student.  I also worked full time and had 5 kids at home.

If she were actually graduating, you would have received an invitation. If she were actually graduating, she'd put it all over social media. She'd be sending invitations and posting so she'd get graduation gifts sent to her.