Timing of delivery is tremendously important in photography. This is obvious in such genres as reportage, event coverage, etc., but even in less obvious genres like travel and family photography I constantly find that sharing the photos immediately, or at least shortly after taking them, makes them more valuable in terms of the emotional impact.
In fact, some professional photographers believe that ability to make the photos available to public (or clients) as quickly as possible is more important than even the quality of the images. I think that there is some truth in it, but some level of quality still determines the inherent value of a photo. However, in every aspect of the production workflow (lighting, costumes/makeup, posing, post-processing) there is a point of diminishing returns, after which additional work results in progressively smaller improvements in quality. Therefore, upon reaching this point in every aspect of the photo production, the image should be shared/delivered. Finding this critical stage could be a valuable skill and is definitely worth practicing. 
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