How to write down the TK for the team by the hour?

Question

Project management

Hey! There is a task in which it is required to write technical specifications for different departments (design, back, iOS, Android)
The essence of the task:
Each feature takes different time for different departments (for design, back, iOS, android 6-2-4-4 hours, respectively) , in total, 24-60-30-40 hours are allocated for the application for design, backing, iOS, android 6-2-4-4 hours, respectively.
It turns out that:
Design can perform 4 features, back 30(!), iOS 7 features, Android 10 features.
Do I understand correctly that 4 features of designers are 4 screens (for example: registration screen, main menu, etc.), iOS and Android are "frontend" tasks (make a registration window with buttons, a main menu button, some then animations, etc.), back is the implementation of registration, authorization using social networks, data storage, etc.?
Question: what tasks can departments have if I describe TODOList?

Answer 1

If you allocate time for features, with a high degree of probability, this time will fail. Tasks should be evaluated by those who will perform these tasks. Judging by the question, you are not aware of the capabilities of your departments, the nuances of implementation, etc., which means you will not be able to adequately estimate their time costs. When you work with them for half a year or a year, then, perhaps, you will begin to understand what they are capable of and what typical tasks they will do for how much. Keyword "TYPICAL", because for non-standard uncertainty of time costs increases sharply.