In short, about 2 to 3 hours, because this is how long it takes to retouch a portrait photo on a professional level. Photo retouching is not a skill, it is an art, and for me it is a valid and essential part of my photography service. Not everyone can appreciate the importance and impact of photo editing because this is something that is done behind the scenes. It is a process you most likely will not witness personally as a model or a client, but it is always greatly appreciated when compared and explained.
Portrait photo retouching is a complex process of refining tonal shifts, removing color casts, redirecting or emphasizing the main subject or area of interest in the photo, removing distractions, reorganizing and tiding up shadows and highlights, finalizing the artistic vision of the photographer, amplifying the existing feel or creating a completely new mood in the photo, creating a completely new image via composite photography or an artistically enhanced creation though photo manipulation (fantasy, sci-fi, abstract, etc.), and so on.
I am an artist, not just a photographer. I do not capture images I create them, and pressing a shutter on my camera is merely a part of the entire process. Portrait photo retouching is my passion just like photography, Japanese calligraphy, book writing or any other artistic endeavor that I am engaging in. I love photo editing so much that I can easily take an hour only to look through already pre-selected photos from a given photoshoot to choose the one I think is the best in terms of body language and quality of light for editing. Time wise, photo retouching is far more time consuming than a photoshoot itself and can take several times longer than image capturing. I will give you an example. Let us say a photoshoot lasts for 5 hours and 600 images are taken. Now if I pick 10 photos for editing and spend 2.5h on each, that sums up to 25 hours in photoshop alone. That is 5 times longer than the actual photo shoot. A single complex photoshop manipulation can take over 24 hours to complete.
In the era of digital photography photo editing options are limited only by the skill and imagination of the artist, and it is a never-ending journey of discovery and learning. Every photo is different, every person ha sits own personality and mood. I do not use any ready made presets in my workflow and each photo is manually retouched, toned and finalized. Every photo is yet another day of the great journey.
Private photoshop workshops via skype - http://www.ryuurui.com/photo-retouching-lessons.html
Photography workshops in Tokyo: http://www.ryuurui.com/photography-workshops.html
Hire a photographer in Tokyo: http://www.ryuurui.com/hire-a-photographer-in-tokyo.html
Photo blog: http://www.japan-in-photography.com/
For more tutorials and how to videos check out my photoshop and photography tips and tricks YouTube channel: https://www.youtube.com/channel/UCEOVGZ2rpLhR7gSPvaexxxQ