The recommendations to solve the challenge you mention are to (a) writing better, (b) splitting into a sequence of meetings, (c) reading the document ahead of the time.
There's no real reason why writing process should not apply to design documents as well.
We try to go slower with such documents. E.g., the meeting may start by asking to read the first five sections and discussing them first. The meeting then may naturally be longer than an hour, usually two hours, and still may need a follow up slot.
Nothing in the Amazon style precludes reading ahead of the time, and it is recommended to send the document to the audience ahead of the time. That people often don't is another thing.
I start reading ahead of the time as I read slower (but also read more carefully and thoughtfully).