Hi, nice question. Not sure what you exactly mean with "CSR outsourcing". There are different takes on this. Lets start with outsourcing the CSR - understood as community involvement - one could create a foundation outside of the company to handle the community issues. The costs for such a foundation vary from country to country and range from maybe 10.000 USD to a million, dependant on the jurisisdiction and of course even more so on the proposed work plan for that foundation.
If you consider outsourcing as having a consulting company supporting you in your CSR exercises, implementing, stakeholder engagement etc. most consultants work on day rate basis and it will depend on the scope of work that has been defined at the beginning of the job how long this work will take.
Hope this clarifies
