My martial arts system (JKD concepts or JKD/Kali) is supposed to be very practical no nonsense, but its also vast in what techniques and systems it draws on. My first instructor tended to focus on stick fighting and knife fighting (stereotypical Kali) parts of our system. I spent the first 6-12 months on this and did not feel I was ready for a typical self defense situation.
My current instructor (we have several at our school) focuses more on boxing/striking/kicking aspects of my system - including sparing and street combat drills. After a year with him I feel I have some basic real world skills now.
In fairness to the other instructor - the stick fighting stuff did/has helped with body movements, angles, and coordination. That other instructor also did help me understand basic boxing - jab, cross, hook, etc.
Bottom line - For me coming in at a later age, with poor body movement/coordination skills, I think a year was needed under the right instructor to have "some" skills. I have seen other newer and younger students come in and get to where I am in half the time.