When you kill a pillager with a banner on him, you gain Bad Omen for 1 hour and 40 minutes, im not sure if this is intentional but as far as i've seen in other bug reports, its supposed to be infinite.
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@unknown Not a duplicate as that report predates actual infinite effect duration. This report is about the duration not being changed, while that one was about it eventually expiring (when infinite duration didn't exist).
Clones is better.
Previously, there was a bug where it would show up as "
" instead of 1:40:00 as it does now. In the advancement "Voluntary Exile", it says the effect lasts "for the time being", which I believe suggests it should only last a few ingame days.