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Yeah, that window is 100 blocks unless there is overtake risk (40%+ basically, though if some pools do not pay attention, it could be done with less; 34% selfish BIP-110 versus a naive 66% non-110 - though that is unlikely, it is not like this is a stealth op.)

So this is what happens:

The exact constraint for "worry" is that within the first 100 blocks post factual fork, when forked coinbases are unspendable, BIP-110 has between 34% and 66% of realized hash power. If it doesn't have that, it's either succeeded or failed and there is nothing to worry about. I think that the whole thing balances on whether you think that this 34%-66% scenario is likely. I don't see it right now, but maybe I am naive.