Answer:
I believe what you are looking for is the formula that was in Dana Turners Manual for the formula. Essentially if you have 15 moving parts such as 15 branches it will require one full time security officer. Here is how Dana wrote it:
If your institution has a full-time Security Officer on staff, it may be following the emerging industry-standard guidelines -- that one full-time Security Officer is needed for each institution that maintains a combined total of fifteen branches and departments ("moving parts"). In other words, if the Security Officer is responsible for providing security services for fifteen institution components (a combination of cash-handling facilities and departments), there are plenty of security-related tasks to keep the Security Department busy.
Using this formula, if your institution has only six (6) "moving parts", the security-related tasks will typically require sixteen (16) person-hours each week. An institution that has fifty (50) "moving parts" may only need one (1) Security Officer if a Security Assistant is hired to assume many of the security responsibilities. The Security Officer simply can't be everywhere at once.
When training people at our annual security school this is formula we use for them. I also follow this when performing a physical risk assessment on financial institutions.
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