You're asking the wrong question.

Watch for a momentum increase (as in now)...

Then place your stop-loss well below the trend line.

Let the market take you out when it breaks the trend line.

BTW I suspect China will surprise us all, pushing this market farther then anyone expects... but don't play that gamble.  Now is the time to put stops in.  But keep them well below the trend line.  You don't want to get stopped out too soon.