This will vary from one company to another. Initially with any data protection implementation there will be a gap analysis where Datahub will assess the gaps and what will need to be achieved for compliance.
From the gap analysis if you want Datahub to support on any remedial actions we can advise on the estimated duration and cost. Initially the only commitment is the cost of the gap analysis, from there we will discuss the next steps.
As a high-level estimate, from our experience, for a small organisation the implementation could take approx. 3 weeks. For large enterprise organisations this could take up to 4 months.