it depends on how seriously u take it. if u do it every single day u should be done in 5 years. only kidding it's different for each person. it depends on how much talent u have
Completely subjective question. It all depends on your natural talent and the amount of time you have to offer to learn. In most instances, an apprentice serves at least a year under a tattoo artist...
It really depends on the type or graphics you mean. Technically if you draw a picture in Microsoft Paint, it is considered a computer graphic. But if you want to become a professional computer...