Only a maximum of 8 people are allowed to trek or visit a given gorilla family in Bwindi, Mgahinga and Volcanoes National Park. Bwindi has about 14 habituated gorilla families and thus each family is allowed only 8 people per day per hour. Sometimes park management is forced to have more than 8 people depending on circumstances on ground. If such happens, the park authorities will explain.
When it comes to gorilla habituation, its only 4 people that are around to spend four hours with mountain gorillas under habituation.