Step 1: estimate for one business process which will take a bit longer as in your initial implementation, which requires RnD and vulnerable to more changes and evolves rapidly.
Step 2: estimate for more than one business processes it should require less time as you already are done the technology and design in first step, and in this step, you enhance it to implement more than one process and come up with fewer changes compare to first step.
Step 3: in third step you are in much better position to provide a complete estimate for the application considering the factor such as numbers of resources and their skills set and level, further refinement required in business process implementation methodology, technology, Tool and Framework support, time, which will be spent on gathering client requirement, deployment, documentation, team meetings, etc.
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