There are several benefits of using Salesforce for business development:

1. Customer Information: Salesforce provides a comprehensive view of customers, including activity history, customer communications, internal account discussions, and social data.
2. Account Planning: Salesforce allows businesses to manage and track customer accounts with a detailed overview.
3. Time Management: Salesforce offers a variety of features that increase productivity, such as calendar systems and task management.
4. Team Collaboration: Salesforce's Chatter tool allows easy communication and collaboration among team members.
5. Analytics: Salesforce provides powerful analytics tools that allow businesses to track their sales trends and business data.

Yes, Salesforce offers a mobile app that allows users to access their CRM data on the go. Additionally, Salesforce provides a platform for developers to create their custom mobile applications.

The development time for a Salesforce application can vary widely based on the complexity of the app, the experience level of the developers, and other factors such as the number of features, third-party integrations, and the complexity of the UI/UX. A simple application might take a few weeks, while a complex application could take several months to over a year.

The cost of Salesforce development services depends on several factors, including the complexity of the project, the number of features, the location and experience level of the developers, and the project timeline. Getting a quote from a development company like ThoughtWin IT Solutions is best for a more accurate estimate.