Apparently this is for training developer for salesforce development. As per my experience in industry we need at least 60 days to finish this training (Salesforce syllabus + One mini project)
Syllabus as below.
Salesforce Admin(OOB functionality like . Profile, permission set, User, App building, Workflow, Sharing Rule, OWD, Process builder, Visual Flow, Approval process, Email template, Validation Rule, Object and many more etc...)
Salesforce Development(Lightning, Aura, LWC, Rest API integration, Connected App, Apex Trigger, Apex Batch class, Future Call, Queueable Interface, POSTMAN, Heroku and many more etc...)