With no obstructions (no walls, or Baroque type furniture) indoor, it will go up to 100' -120'
Once walls get in to the equation it is a fast decline.
Outside, with line of view on top of towers with good directional Antennae it can work for few miles.
This is the Nature of 2.4Ghz. The microwave band.
Many years ago I use to DX the world with 100 Watt transmitter. But that is done using the 20 meter (14Mhz) band.