When using a Reload, reloading the half bowl is quick and easy. You don't need to wait until it cools to reload either. In fact having residual heat in the device is good for the next bowl, as you can use the VI and apply less heat. So it gets really efficient when chaining bowls like this. Although the max I go for is 3 half bowls, as the potency can be something to be reckoned with.
I use half bowl setting when using indoors, and use a small dry glass piece. The reason is for me it is a perfect lungful, that does not induce strain or coughing. When I have it full bowl I prefer Ti or wood stem and take casual multiple hits. Here is a video of half bowl in action, with subsequent avb pic.