A Long Long Time
Until we are compassionate to all beings, including ourselves, we are doomed to repeat the lines 'lest we forget', 'stop racism', 'equality for women', 'keep our ancient forests', 'reduce reuse recycle', 'do not eat our friends', 'rats have righton', and so on so forth.
Some are under the impression that they are superior somehow. This is apparently a justification for the presumed dominance and ill treatment of others. It has been suggested that some are more intellectual, can reason better, can control and manipulate their environment.