Quote Originally Posted by President.Apache View Post
have you guys noticed that the time to level up a skill, (humor, art, blablabla) is diffrent per skill, the first few, like humor is shorter than artistic and trick even if it's to go to the same level.
You can very roughly count the position of the skill to its level to comprare skills. The actual upgrade time does seem to be rather arbitrary. It grows. But the only things I can tell rather safely: they do grow slower then the money demands and they do less than double each lvl. And since they grow slower than money requirement, I felt no urge to investigate further.

Should you plan on collecting data, do not forget to write down your game bonus. It tells you the decimals in the shop where you can press reset.