Where have you got that from? I heard there's no pre-loading at all...
http://www.rockpapershotgun.com/2015/08/20/metal-gear-solid-v-the-phantom-pain-pc-preloading/
What he’s saying, I believe, is that though the game doesn’t officially launch until 10am Pacific time on September 1st, folks who have pre-ordered it will be able to start downloading as soon as it turns September 1st in New Zealand. That’ll be 1pm on August 31st in the UK, and these times in other zones. He adds that it’ll be 28GB to download, so when exactly you’ll get to play depends on your connection, but you could theoretically start playing before the general populace of consoleers.
Clarification on the pre-load situation - https://www.reddit.com/r/MetalGearSolidV_PC/comments/3hnfle/no_preload_clarification/
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