It depends on various factors like size of the product, numbers of tables, pages involved, existing coding etc. We have developed this framework keeping the engineering challenges in mind for SaaS providers. Close to about 30-40% of engineering functionalities are common across different SaaS solutions. Yet everyone begins the development from basics.
The amount of time it takes to port is highly dependent on the size and complexity of your application. Given that you would have to port your application to SaaS anyway, CelloSaaS provides the fastest path to SaaS since the port requirements are fairly minimal.