How much time do you currently spend on planning?
We are a community bank and if it is an area that we have done in the past and have sufficient knowledge on, the planning phase is not very long (enough time to prepare a listing of what will be needed and print off the audit program and previous audit report.)
If it is an area that we are unfamiliar with, or if there are policy/regulatory changes more time will be needed to prepare an updated audit program (or write a program). Time spent could amount to an entire day depending on the circumstances.
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Do what you can, with what you have, where you are.
~Theodore Roosevelt~