How far into the story hour does book 1 and book 2 take you? (IOW, how many books will there be to complete the story hour?

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The books don't map perfectly to the campaign, since I changed a bunch of stuff, dropped some side-quests, etc., but
Book 1, The Ventifact Colossus, goes through (shockingly) the summoning of the eponymous beastie.
Book 2, The Crosser's Maze, covers the entire journey across Kivia to find (shockingly) the eponymous artifact.
[Warning: Spoilers ahoy in the following descriptions!)
Book 3, tentatively titled The Portal in the Woods, will cover the short period of time between the party's return to Charagan, and the Battle of Verdshane.
Book 4, tentatively titled The Infinite Tower, will be primarily about the journey into Het Branoi to retrieve the third Eye of Moirel.
Book 5, tentatively titled A Splinter in the Heart of the World, will be primarily about the party's journey into the subterranean depths of Spira to prevent the arrival of the Adversary.
There is, I'd estimate, about a 10% chance that either Book 4 or book 5 will be long enough that I'll have to split it into two volumes. But right now I'd say 90% likely the series ends with five books.