The downloads retroarch.vpk and retroarch-data.zip are now updated every night, at midnight, PDT, to the latest buildbot release from https://buildbot.libretro.com/nightly/playstation/vita/ .
I haven't checked how long it takes to unzip the data files using Vita Homebrew Browser yet. It is possible that it will take a while, since it is a zip file with almost 4,000 small files.
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