What is the height, distance and guaranteed support time of hotel fire emergency lights, emergency exits and evacuation signs?

Evacuation emergency lighting should be located on the wall or ceiling. The safety exit sign should be located at the top of the exit; The signs of evacuation walkways should be emergency lighting and light evacuation signs, and a protective cover made of glass or other incombustible materials should be set. Emergency lighting and evacuation signs can use batteries as backup power supply, and the continuous power supply time should not be less than 90min.