How long will this manga take to end? I just start losing my patience.

Chapter 14 came out this month in Japan. It was the last chapter... They haven't given a release date for the books yet but it should most likely be in 2 or 3 months. The scans might come out quicker once the books are out.
Well 5 years to publish two books worth of material is an average for Nojico-sensei... At least this series didn't go on a permanent hiatus like half of her "current" works are ╮(￣▽￣)╭