I was spoiled on Kindle Scout the first time. The Trouble with Time (Time Rats 1) was selected within 48 hours, before I'd begun to look for a result. Its 30 days ended midnight Seattle time on a Friday, and I found it had been chosen over breakfast in London on Monday.
Dreams of the Machines (Time Rats 2) took ten days, testing to the max my resolution not to fret. The offspring said, "It doesn't matter if it's not chosen, you can just self-publish," and this was true and comforting. Still, it's nice to be picked.
I've always maintained that it's a waste of time struggling to keep one's book in the Hot & Trending chart, so I didn't. I'm not saying that Amazon takes no notice of it, just that they are not likely to be impressed by nominations resulting from paid advertising, or hundreds of Facebook acquaintances clicking without reading just to be nice. A new website has sprung up (I'm not going to link to it) which for $94 will email 175,000 people about your campaign. They allow you to use this service every seven days. As well as this sort of thing, writers swap promotional ideas on forums and the bar gets ever higher. TR2 spent 49 hours out of a possible 720 on the H & T, all at the end, and had 406 page views. This is an exceedingly modest score - TR1 had 155 hours, and 572 page views, and that was hardly earth-shattering.
It's possible Amazon takes note of the ratio of nominations to views, and whether people nominate your book on the last day hoping for a free copy because they actually want to read it. It's nonsense to suggest that a good score will guarantee your book gets read, or will put you to the top of the pile. Kindle Scout editors consider every book. Many books have spent most of their 30 days in the H & T and been turned down. I'm not convinced that Amazon is interested in evaluating an author's marketing skills, either. What they want is a well-written book they think will appeal to readers - give them that, and they can handle the marketing. Anything you can do is a drop in the bucket by comparison.
I like TR2, and hope my readers will too once it hits the virtual shelves.