15 yards and 25 yards.
15 yards is the furtherest I'd have to shoot inside my house. 25 yards is about the distance I'd have to shoot if someone pulled in my driveway and started shooting.
What's really fun..and moderately educational...is to shoot in zero light conditions. Hole of Calcutta type of stuff. When some buddies of mine owned the local range, we use to do all sorts of stuff after hours. Putting a blinker on two targets at different ranges in a Hogan's alley and then turning off the lights was always fun. The blinkers were suppose to represent muzzle flashes being fired at you in a completely dark environment. Your object was to shoot back and try to hit the target. Very educational and fairly representative of something similar I once experienced.
Shooting on a well lighted indoor range, or on a sunny afternoon outside, is completely different than shooting in your living room in the dark at 1:00AM, and with a jittering flashlight that you are trying to balance in one hand (or sweeping around a room to bring back on target if its a tactically attached flashlight on your firearm) than it is to shoot in the daytime. I honestly think all firearms ranges should offer "low light" training scenarios, because roughly half of every day...is night.
We did experiments on who could win in the "I've got a flashlight, you don't" contest...as could happen if a homeowner comes downstairs with a flashlight in hand, or has a tactical light mounted on his gun. Best advice... you better have your flashlight pointed straight at the target when you turn it on and ready to fire, cause if you don't you are a bullet magnet. If you have your flashlight pointed at the wrong corner when you turn it on, you suddenly have bullets flying at you. It's bad enough in one-on-one shooting, but add two people as "home invaders", put them in two different locations in a dark room and your odds really get bad. We blasted each other with paint guns about a million times doing that stuff.
We shortly thereafter developed the "shelter in place and call the cops plan"
which involves fortifying your bedroom, playing a tape of a Doberman Pincher snarling and barking at decibel level 90 on your home entertainment speakers, and screaming at the top of your lungs, "Martha! I've got the shotgun! Let Blood Fang off his leash and call the cops!" If anyone is stupid enough to rush your bedroom after that, give 'em both barrels...cause they're insane.