The Cost of a Session
Approaching it from a time standpoint, let's imagine that you have hired a photographer who has work that you love. This photographer is traveling up to an hour to your destination to photograph your session. Here is an example of a time break down:

Booking - client contact time and paperwork - 30 minutes

Pre-session Preparation - equipment and back up equipment checks + vehicle checks - 30 minutes  

Travel - up to one hour each way - 2 hours 

Session - meet and greet, actual time spent taking photos - 1 to 2 hours  

File Management - uploading and backing up images - 30 minutes  

Image Editing - selecting the final 30 or so images from 200-400 that were taken, cropping, color, minor blemish removal, white balance, contrast and sharpness editing - 4 - 16 hours  

Preview Gallery/CD - constructing online preview gallery - 30 minutes
   
Ordering Session - preparing products and loading images into ordering program, and creating final order -   1.5 hours  

Order Assembly - preparing digital files for print, filling out order forms and sending to suppliers,  putting together albums and other products that require assembly - at least 2 hours   

Miscellaneous - usually client contact time, emailing, phone calls, organizing and discussing orders,  keeping client updated on order progress - 30 minutes

In this example, the time spent per client can extend past 20 hours. This is time dedicated only to one session.  When the photographer charges a session fee you are not just paying for two hours of their time, you are paying for multiple hours of work to complete your session.
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