Dissolution rates are highly affected by the crystallinity of the material. Therefore fused quartz crystals will dissolve much slower than if you try to dissolve the same crystal that hasn't seen that much heat. Therefore, there is no simple rule, but also please see this comment:

Article How predictable are dissolution rates of crystalline material?

Here in our institute we make epitaxial AlN. If the crystallinity is bad or the material is even amorphous, it's so sensitive to hydrolysis that you can actually "smell the low crystallinity" due to ammonia formation, while if you take the best material my colleagues have in stock, it will be so inert that you can put it in smoking hot acids for an hour and it won't be gone completely.

@Jürgen Weippert

Thank you so much🙏🏻