There is no specific amount of time that one must play dead in order to stay alive, as it depends on the situation and the predator's behavior. However, some general tips for playing dead include:

- Remain completely still and silent.

- Avoid any sudden movements or sounds.

- Close your eyes and relax your body.

- Breathe slowly and shallowly.

- If the predator begins to walk away, stay still until it is a safe distance away.

It is important to note that playing dead is not always the best strategy for survival. In some cases, it may be necessary to fight back or flee. However, if playing dead is the best option, it is essential to remain as still and silent as possible until the danger has passed.