Does 24 hours include learning how to use a game engine that you've never used before? When you've never used ANY game enginer before? Maintenance and new feat

Does 24 hours include learning how to use a game engine that you've never used before? When you've never used ANY game enginer before? Maintenance and new features are more of the same already done. Networking code is a library. Sound is a library. Cross-platform is a library. Shaders are a library. AI fixed bugs.