Same lighting element is in use so it would be normal useage as far as lifetime is concerned.
Don't understand this question. Pulling the stalk back flashes the high-beams. Pushing forward turns on the high-beams and keeps them on. There is only one bulb in the HID system. When the high-beams are activated a motor moves the entire projector assembly up and down. That is why there is a momentary delay, and you can hear it move as well.