Process improvement can take many forms.  Top-down approaches such as Lean and Six Sigma are very effective at eliminating waste from operational procedures.  Robotics (or RPA) has the potential to automate mundane tasks and massively free-up staff time.   Continuous Improvement/Kaizen which is also a key element of Lean is itself its own speciality.  BPM can also integrate with Lean to deliver improvements with process control and automation.

These approaches have their own time-frames to implement and generally accepted ratios of improvement and of course depend on the context in which they are to be implemented.   A quick look assessment can determine the best path to proceed and takes one day.