Hi Andy,
thanks a lot for the swift reply, it was a little less time than what I've hoped.

Hi there,
first of all, wow what a fantastic project. I think this is what I need to create a prototype of an idea I have.

It's kind of basic. I need to create a script that counts up for each day and displays the number on a display. Also a button that can reset the number. But I need to know, for how long (I know it's just a guess) can the battery power the display, if it just have to show a number, and nothing else (the number changes each day, and thats it)?

This is the screen I'm talking about.
https://tinycircuits.com/collections/all/products/tinyscreen-basic-kit