A photo shoot is more than just standing in front of a camera and waiting for the shutter to click.
Each genre and framing needs planning and preparation: this can be anything from a short briefing via phone or WhatsApp or up to a couple of weeks of work with lots of people involved.
A test shoot doesn't need a massive amount of planning. You should know what clothes to bring and the type of make-up if no make-up artist is on set.
On the other side, a fine art glamour shot with lots of props might take weeks, if not months, to plan and prepare, from creating the looks and building the set.