Photo Editing can be as time consuming or even more than the actual Photo-Shoot. Different categories of Photography require different processing skills. Some of those involve, colour correct images using a colour card when needed, enhancements, collages, manipulation, blemishes, skin tones, etc.
The Output of a Photo-Shoot or Photo Editing process should be established at the very start so that the most efficient path is taken to achieve an optimal result.
I work with an IPS screen + colour calibrator in order to ensure accurate colour rendition . I also use a graphic tablet to facilitate the retouching processes.