How often does the difficulty adjust?

Currently all seems fine and paid from the pool! (Update from yesterday)..

I read somewhere Admin had a birthday..? Well, so did I Wish ya all the best, and hoping for a great future of BITSUM, looks totally promising !

Hey, I have around 1 KH/s of speed, and I am mining for about 20-24 hours now. It is all going fine but I don't get 1 thing...



And my wallet is stuck on 4.7k since about 5-6 hours.

How often the difficulty adjusts?