Incase there are any pico 8 users, I made a little solo rpg kit.
It has a dice roller, a simple oracle, a Norse rune picker, a stat generator and a hex terrain generator.
If you arent familiar with Pico 8, The code is embedded into the image. Get a pico 8 player and load this image and your good to go.
Tough question. I initially just set out to make a dice roller which was super fast. Then I kept sitting down with it and expanding it for fun. So maybe 5 or 6 hours total?
Ok, so quite fast. Cool.