Medical experts usually say the average person can live for 4 to 6 weeks without food. The amount of time someone can go without water is much shorter, roughly a week (or less).
Your employer can force you to take leave at a particular time as long as they give you at least two weeks' notice. However, it is common for employer and employee to come to an agreement about the timing of annual leave. If you put in a request for leave, your employer has to have a good reason to refuse it.
How much notice do I have to give my employer when resigning? I have been with my current employer for 4 months and the position is not working out. I have told my boss I am not happy. I am planning on moving interstate and want to go ASAP; however obviously need to give notice.