What is the maximum time taken to complete the most difficult task?

The maximum time spent on the most difficult task depends on the complexity and volume of work. For example, in one project, I worked on integrating a complex module, which took about 3 weeks. This included:

• Requirements and architecture analysis
• Development and testing
• Debugging and fixing errors

Such a timeline was driven by the need to deeply understand the system and ensure the reliability of the solution. It is important to plan tasks considering possible risks and to leave time for testing and fixing errors.