How old should a kitten be before they can left alone?

It's generally not advisable to leave a kitten alone for any extended periods of time, especially while they are still very young. Kittens under the age of eight weeks require constant care and supervision. After this age, they can be left alone for short periods of time, but it's important to gradually accustom them to being alone and ensure that they have everything they need while you're away. As a general rule of thumb, it is best to wait until your kitten is at least six months old before leaving them alone for longer periods. Even then, it's important to start slowly and gradually increase the amount of time they're left alone, making sure to provide plenty of food, water, and interactive toys to keep them occupied.