If the government were to shut the country down like new Zealand did how long do you think it would be before this virus is over.

The virus will not die , it will await in a dormant state until it has run its course n Earth. It will become active even in a closed system, just as all viruses do. The length of the virus active state is dominated by a conscious level born by the virus . When it's purpose in this reality is achieved it will disappear as quick as it came until it rises it ugly head again in the future