Don't quote me, but I recall a statement from one of the prepaid esim FAQ's that up to 50 esims can be stored on capable phones. I have no idea if this is true or varies by phone make & model, but it was in print on a prepaid website. I have no idea which one, and it could be just BS, but it shouldn't require much data space, so I can see it being possible.

But wait, there's more!

I just did a little research on the subject and found a GSMA eSim Whitepaper with this quote:

How much memory will be available in an eUICC and how many Profiles can be stored into it?

The memory of an eUICC can range from several KB to several MB. There is no specific limit on the number of Profiles that can be stored on an eUICC, this depends only on memory available and the size of Profiles. Operators could manage Profile sizes to fit them in the eUICC.

Reference: https://www.gsma.com/esim/wp-content...aper-v4.11.pdf