Ecash mints are not new, what enables them to thrive is that for the first time in history we have permissionless financial rails for free banking to actually thrive. 

 Where can I learn more about how this works in pratice? 

 https://cashu.space/ 

 🌎🧑‍🚀🔫🧑‍🚀

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 How long from now until a mint can make you a loan?
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 Then that mint should pay interest too 

 Interest to whom? I was thinking in a mint that works like ledn or similar for example, where you have makers and takers and you should over collateralise your loan. 

 What do you borrow and what do you lend?  

 Interesting, I supposed you borrow sats and get the mint denominated token, for example can be some sort of stables like https://umint.cash/