a year. In fact, you might not even be as good, if you don't practice properly. Beyond 10m is rifle work, beyond 6m and more than 2 guys is rifle work, too. You are just in too much crap to realistically get out of it with nothing but a ccw pistol. If you envision being in that sort of crap, best keep a canned CAR REAL handy, wear armor all of the time, and have both smoke and frag grenades ready to hand. Compared to that level of preparedness, even world class pistol ability is left sucking air, When it's for blood, pistol ability is degraded BADLY. The rifle, being 3x as long and heavy, and SUPPRESSED, and much more likely to have a real effect, even with a POOR hit, and being braced upon cheek and shoulder, is a LOT more likely to get the hits, instead of just standing there MISSING a lot,like the pistol is going to do.