The amount of time a dog can survive alone at home will be affected by a variety of factors, including the following:

Diet and water supply: Adequate food and water are key.

Age and health: Puppies and sick dogs may be more vulnerable.

Environmental conditions: The temperature is suitable and there is a comfortable place to rest.

Excretion requirements: sufficient space and a clean environment for excretion.

Training and Habituation: Dogs that are well trained and used to being alone may be better off.