Disney has set a Disney+ global premiere date for Guardians of the Galaxy Vol. 3 of Aug. 2, that’s 90 days after the pic’s theatrical release of May 5.
Its VOD release was on July 7th (so about 60 days, I guess), so that's when it became "available" on the Internet (whether you wanted to pay for it or now), effectively shortening the window somewhat.
Likewise, The Flash (different company, I know) popped up today.
Yeah I just noticed that The Flash is available for home video now, I might buy it soon