No idea, just based on what the gas guy told my mom after he went to turn our gas on. I'm pretty sure he mentioned inside. My furnace and water heater are in the same area, and that area is about 15ish feet from the meter outside. Pretty sure its mostly a straight shot too, with probably just 1 90 degree turn.
Haven't had heat for the past few weeks, but it is getting colder. Been getting by on space heaters and taking showers at my grandparent's house, who luckily live up the street.