lens change on hvx w/ 35 adapter

[odin wadleigh]

I am going to shoot a music video with the hvx 200 and redrock adapter with 35mm lenses.

I heard it takes awhile to switch lenses on that camera, since the adapter goes on the end of the camera's lens. something to do with having to always adjust the backfocus?

I like to always change lenses and am worried this whole system might bog the shoot down.

how long should a competent AC be ablet to change lenses on that system?

thanks