I calculate that to be between a 70 day operation for average transactions at 3 tps, to 76 days for 1 input to output at 7 tps. Or maybe I need another cup of coffee to wake up if I have calculated it wrong.
not an exact science. i used the average of 2100tx per block*144 block with the 18mill tx average
18m/144/2100=59days
but think about it. 18million transactions (46mill outputs) all trying to rush to 'opt-in'
... mempool crash
but think about it. will malicious users 'opt-in' or see a good oppertunity to stick with native-to-native and cause further disruption while the sheep think they can achieve 100% voluntarily.