Could duralumin make a speed bubble bigger instead of just lasting longer

[strmblsd he/him]

The question is pretty much said, we know that it can make it last longer and compress more time but could duralumin make the bubble significantly bigger instead?

[The White Drake]

Questioner

If Marasi could burn duralumin, would that make time go faster or her bubble get bigger? 

Brandon Sanderson

This is on tape so I have to make sure I do this right.

It is less about the size of the bubble and more about speeds. You can expand the size and change the size of the bubble, so it's possible that you could use duralumin for either one if you knew what you were doing, but the speed is the more relevant part. So, I just wanted to say that correctly.