I believe it's three extra months past your currently active subscription.
Best posts made by stephen
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RE: New Shonen Jump Overhaul! - FREE OP simulpub + paid backlog
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RE: One Piece Special Box Sets, on sale 4th September in Japan
Just saying… I'm 99% positive those are just pictures of the boxes themselves. The contents, just like the Viz box sets, are going to be the normal volumes you can already buy. You can tell from the way that ad says "For readers who already have the volumes, we are working on a way to sell just the box and will provide an update in future issues of Weekly Jump."