I have to calculate the required number of staff (-> support costs) for using and managing a specific software system which is an on-premise solution and can manage devices like mobile devices, notebooks etc. and deploy internal enterprise applications.
I know that there are a lot of parameters like amount of users who will use the system and need support, how many software updates per year, support time (24/7) etc. But I want to know how can this be calculated in general? Are there any best practices or methods which I can base me on?