def wait_for_disappearance(self, timeout=<NUM_LIT>):
start = time.time()<EOL>while self.exists():<EOL><INDENT>self.poco.sleep_for_polling_interval()<EOL>if time.time() - start > timeout:<EOL><INDENT>raise PocoTargetTimeout('<STR_LIT>', self)<EOL><DEDENT><DEDENT>
Block and wait until the UI element **disappears** within the given timeout.

Args:
    timeout: maximum waiting time in seconds

Raises:
    PocoTargetTimeout: when timeout