I was with Elecsa. Whole process was about two to three hours. They have an iPad with a check list of things they have to ask you.
Most of the time is spent in the ‘office’, checking paperwork, mft, voltage detector etc. Asking questions, about work, regs. It’s done in a relaxed way. If you don’t know the answer, they talk about it. Not done to catch you out.
Rewire will be a good one to start off with, and showcase your work. As others have said, they’ll ask you to show safe isolation, then go through some of the dead tests, then some live tests. Not all, but you should be able to tell them the series of tests in their proper order. Again don’t worry if you make a mistake. They know it’s being done under a classroom assessment. Normally something list disruptive to the installation, like an RFC or cooker circuit.
Good luck.