Developing a Zengo wallet clone script widely depends on the advanced features and customization level that you want to incorporate. It takes 4 to 6 weeks to build a basic clone with standard functionalities, including multi-currency support, biometric authentication, and keyless security. If you’re aiming for a customized solution with additional features like cross-platform support, military guard security, and seamless integration with multiple blockchain protocols, the timeline can extend to 6 to 12 weeks. 

The process starts from UI/UX design, followed by frontend and backend development and ending with comprehensive testing and security audits. Post-launch support and ongoing maintenance, such as regular updates and security patches, should also be factored into the overall development plan. Therefore, the time to build a Zengo Wallet Clone Script can range from 1 to 3 months, depending on the scope of the project and the development team's efficiency.