if you are doing short term, you just can'tIf you are doing buy and hold, why do you care? We are living in Asia zones, think about your family precious time, your personal health, your emotion involved... We have to strike for a balance.
every cycle has only one extreme high price.if one is a "long-enough term" investor, one should not mind to sell on the second high. but this definitely doesn't apply to speculator.
so which one are you? you have to ask yourself