When do unique_ptr get destruct when it's stored inside a global map?

I'm having hard time to understand life time semantics of smart pointers when they are stored inside a global unordered_map.

Consider this global code block,

struct Connection {
  // Variables goes here
};

std::unordered_map<std::string_view, std::unique_ptr<Connection>> connections;

Do this connection object stored in unique_ptr get destruct when you just perform a one time lookup on map then access it?

If yes, how could I make it available for multiple times not just 1 time?