This command gets the estimated percentage of the light map calculation that has completed.

return float = LM Get Percent( )  

This command does not need any parameters.

s The percentage the lightmap thread has completed (0-100), -1 if no thread found.

The first 48% is allocated to assigning objects to textures, the next 48% is assigned to calculating the light falling on each object. The final 4% is for saving the textures and applying them to the objects.