Since when can't you remake after 3 minutes?

So I had a game recently and my jungler disconnected at the start of the the game (so before 3 minutes) they did buy their items but disconnected immediately but for some reason we couldn't remake was very annoyed by this because it ment I lost my promos. It was really funny because that game went on for like 30 minutes and we were destroying them 4v5 but since we didn't have that extra team mate we couldn't capitalize on anything with out them split pushing this just makes me more annoyed because easily would have won that game. But I would like to know the reasoning behind us not being able to remake.
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