Look at your work of today and then back at your work of 5 years ago or even 2 years ago and compare the two. If you can not see an improvement in your current work over you passed work then you are going in the wrong direction.Becoming a master is a lifelong journey! Every new project has it's challenges, and each time I feel like a beginner all over again! It's a very humbling experience. I always fall somewhat short of the mark. If you keep growing and challenging yourself as an artist, you're always striving to get better, perhaps in your mind, you never become a master, which by definition could also have an egotistical component to it. The mastery of certain skills of a trade would qualify one to call themselves a master craftsman. Nevertheless, beauty is in the eye of the beholder! Everyone has a different aesthetic sense, and the concept of being a master can be somewhat of an intangible! You have to always put in your time, pay your dues, get an incredible amount of experience. There really is no time frame for this! It takes as long as it takes. Everybody is different. Finished no, only just begun! My teacher said " Consider each finished project, a starting/launching off point and inspiration for the next." Get the most you can out of each artistic endeavor, striving to continually improve your craftsmanship, and acquisition of the technical skills required. And in time your diligent efforts and high standards will be reflected in the increasing quality/level of your work. The satisfaction comes each time in the surprising outcome you have achieved , when you feel you have taken each assignment as far as you can with your current skillset.