def get_all_face (entities, face_arr = [])
        entities.each do |entity|
            if entity.is_a?(Sketchup::Group) || entity.is_a?(Sketchup::ComponentInstance) 
                entities_inside = entity.definition.entities 
                get_all_face(entities_inside, face_arr )

            elsif entity.class == Sketchup::Face
                face_arr << entity
            end
        end
        face_arr 
end

current_time = Time.now
formatted_time = current_time.strftime("%d/%m/%Y %H:%M")
puts "Start time apply layer: #{formatted_time}"

model = Sketchup.active_model
layers = model.layers
all_entities = model.entities
all_face = get_all_face(all_entities)

model.start_operation("apply Layer", true)
    my_layer = layers.add('my new layer')

    for face in all_face do 
        face.layer = my_layer 
    end

model.commit_operation

current_time = Time.now
formatted_time = current_time.strftime("%d/%m/%Y %H:%M")
puts "End time apply layer: #{formatted_time}"