T55656 will go out with 1.26wmf18 and 1.26wmf19 and needs an ElasticSearch reindex according to Niklas.
IIRC the reindex on translatewiki.net required less than 45 min, I think Wikimedia wikis have less documents so the time required is probably similar. Update: we know there are 750689 documents as of DCausse's comment on https://gerrit.wikimedia.org/r/224651