Like most roguelikes you can spend a few minutes playing or hours, its really up to you how many times you want to keep playing.
http://www.robotloveskitty.com/LoD/
http://steamcommunity.com/sharedfiles/filedetails/?id=108895757

I'm an Engineer and built the video game community Cheerful Ghost and text based mini-MMO Tale of the White Wyvern.