I'm a Masters' student in maths and it's close to my thesis oral defense. As such, I'm preparing my slides to present them. However, I'm feeling that my presentation has too many slides (albeit my equations are quite long as well), but at the same time I'm afraid of handwaving things too much if I omit some prrofs and such. To add more doubts, I watched a friend's defense and it was quite smooth, but later he told me there was 96 slides.
How do I decide if my thesis is getting too long? Is there some time metric (like time per slide) that can help? Is it OK if I omit the proofs of my theorems (and only mention the ideas of demonstrations while I'm talking)?
I saw some other questions and articles around, but I wanted some advice more related to mathematics, where rigorous proofs are expected and equations can get quite long.
Edit: It seems I have 45-60 minutes to present all the content, however I see fit (no presentation templates and such)