Best guess/theory from when they first uploaded, their first update to the latest one.
And if the dev is from America (guessing) that'll be 18:00-ish when they are uploading it, so time for it to load and fix some early bugs before calling it a night.
It depends on which country or city the developer lives in, because they might be in Eastern North America which follows one time zone or in the East, which follows another.
