How long does it take to build an eCommerce mobile app?

The time it takes to build an eCommerce mobile app can vary depending on several factors, including the complexity of the app, desired features and functionalities, design requirements, development approach, team size, and the level of customization needed. Generally, building a robust and feature-rich eCommerce mobile app can take anywhere from a few weeks to several months.

Here is a breakdown of the different stages involved in the mobile app development process and the estimated time required for each:

1. Planning and Requirements Gathering: This phase involves defining the size of the project, conducting market research, and gathering requirements from stakeholders. Depending on the complexity of the app, this stage can take anywhere from 1 to 4 weeks.
2. Design: The design phase includes creating wireframes, user interface (UI) design, and user experience (UX) design. This stage typically takes 2 to 6 weeks, depending on the intricacy of the app's design requirements.
3. Development: The development phase involves coding the app's front and back end, implementing features and functionalities, and integrating APIs. The time required for development can vary significantly based on the complexity of the app and the number of features. Generally, it can take anywhere from 8 to 20 weeks or more.
4. Testing and Quality Assurance: Thorough testing is crucial to ensure the app functions correctly, is bug-free, and provides a seamless user experience. The testing phase can take 2 to 6 weeks, depending on the app's complexity and the extent of testing required.
5. Deployment and Launch: This stage involves deploying the app to the relevant app stores (such as the Apple App Store and Google Play Store) and ensuring it meets their guidelines and requirements. The deployment process typically takes 1 to 2 weeks.

It's important to note that these timelines are approximate and can vary depending on the specific requirements of the eCommerce mobile app and the development team's efficiency. 

Additionally, factors like iterations, client feedback, and the need for post-launch support and maintenance should also be considered when estimating the overall timeline for an eCommerce mobile app project.