Thanks for that vid, but are there any ways to do it in a .PHP file, which i could make in e.g Notepad++?
I dont want to pay for hosting atm

Do you have any tutorials showing a Cron, as I'll clueless with that...

I'm making my game at the moment in PHP, and if you have 200 metal, you can buy a refinery, which instantly gives you 350 metal after, but how would I make it so that instead of 1 large sum, it gives you so much metal/hour depending on the level of the building?

Is it possible to do timers saying how long a building will be built, in seconds, minutes, etc? If you know, could you please tell me? Thanks.