How long until a team plays on autopilot?

There is a phrase that appears almost immediately whenever a new manager takes over a football club.

He needs time.

It is a widely accepted idea in football. The challenge, however, lies in defining what "time" really means in this context. Is it ten games? Three months? An international break? A full preseason? One transfer window? Or even two?

If a manager arrives on Monday, the players grasp his concepts by Tuesday, and they play a match on Saturday, why shouldn't we expect to see immediate results?

The answer likely involves a mix of football, psychology, and physiology. A new manager is not merely altering a formation on a tactics board; he is asking players to process different information, make new decisions, coordinate those decisions with 10 teammates, and potentially perform at a completely different level of physical intensity. This process involves multiple adaptations occurring simultaneously. Perhaps the most important question isn't:

How long has the manager been there?

It is:

How far is the team being asked to travel from what it already knows?