There is always hope. The medical statistics for someone who has cancer spread to multiple parts of the body do vary by what kind of cancer it is. Even though the average five year survival rates are low, it turns out that sometimes people defy the odds and survive longer than the statistics suggest is likely. Don't give up hope while there are still treatment options available, sometimes the results are unexpected.
It depends. It depends on where the cancer originated and to where it spread. Some cancers are more aggressive than others. But nobody can predict an individual patient's survival accurately. We know general statistics, but not individual outcomes. Survival may be from weeks to months to even years.