I'm asking this because I have one of those Chromebook-style laptops (Lenovo 110s) with a 32GB SSD and 2GBs of RAM. Amazingly enough, and very under advertised, Neon uses less than 400MBs of RAM, about the same as Ubuntu Mate! So, my next consideration is the amount of disk space it uses.

Great question!

A KDE Neon User's Edition (Non LTS) install will take up around 10-12GB of hard disc space (With the 3rd party software installed).

I recently did a fresh install on another laptop and it used 7 GB of disk space.

I did a fresh install yesterday. Adding LibreOffice, about 25 multimedia packages, updating to the latest kernel & the nvidia driver - clocks in at 28 gb.