I always teach my students to divert from a known point. If your positoin right now is the middle of nowhere, then fly to a definite point and start your diversion from there
You are asked to divert. Ask why!
Sick passenger, deteoriating weather and the like - divert immediately.
Operational reasons - divert as soon as practical which could mean continuing to a suitable fix.
Again with the sick passenger, you can not spend time doing a nice hold while you draw and calculate but if the diversion is operational then you could spend the time but your boss would prefer someone who can waste as little fuel as possible.
Thus to demonstrate the ability to operate to commercial standards, I would expect an immediate diversion done roughly and then fine tuned......hense when asked why I always say seriously ill passenger!
Regards,
DFC