This code is executed when you want to mine the genesis block. The easiest way to generate a public key is by going to this page. It's not the best way, but it's the easiest.

I honestly don't know what's this genesis block generator you've brought me. I didn't give you any python scripts. I told you to either run the genesis.exe or build the genesis.c. No, it's not normal to take you 24 hours for a block with difficulty=1.