How long morning routines can be considered healthy?

I'm a father of two kids. I have them every other week, and I've had this arrangement for seven years since my divorce. Our situation at home is stable, we haven't moved, school is the same, etc. My daughter is in sixth grade and over the last three years her morning routine has become more and more elaborate. At first is was manageable, she got up about an hour before it was time to go to school. In short, this time is about yoga, breakfast and makeup. About a year ago, she negotiated to get up 15 minutes earlier, expanding her yoga routine a little and makeup even more. This morning, I noticed she pushed back 15-20 minutes more. So now her morning routine is a full 90 minutes!

If I try to address this, I get told "You're a man and you don't understand!!!", and no willingness to talk about what is reasonable. I will, of course, discuss this with my ex (we don't agree on everything, but we communicate well). But 90 minutes in 6th grade? I feel this will only escalate. I do understand that this is her "school armor", but still.