It is difficult to give an exact timeframe for Power App implementation as completion is contingent on multiple factors.
In order to use your existing data for the application, your data needs to be converted onto the common data service. This is essentially a set of standard entities and attributes that all of the Power Platform tools are built on. This allows users to use the tools harmoniously with one another and seamlessly. Synapx spends the first stage of implementing Power Apps sorting through all of your data and converting it onto the dataverse which can take different amounts of time depending on how the current data was stored.
Additionally, depending on your organisation’s requirements, Power Apps can be implemented in multiple ways for different functionalities. In order to fulfil all of your needs, applications may need to be more or less complex and we may need to create multiple applications. This can also affect the length of time it takes to implement Power Apps at your organisation.
We can provide more information and accurate timescales following an in-depth consultation call with your business.