While the effects are not yet finalised I have edited the same photo a couple of times with different lighting effects and blurs to achieve a few different images from which I will pick the one I think works best.
I never just edit the photo the one way, but rather do it a few times to see what can be achieved and then work on the photos from there. In this way, often, one photo could be used to generate a number of different pictures from different eras/ages/life stages.
Time taken = 1 hour.
Total Time taken = 1 hour.