When I read Amanda Hocking’s blog it seemed that all her reviewers read her books in one or two months. Later I found out that Amanda writes young adult fiction. And these are the books that were in greatest demand at that time.
In the case of crime stories, things are slightly different. The waiting period is usually at least 4-6 months. In extreme cases, your book will get read in two months or after more than six months. Some bloggers told me that it would be my book’s turn only in 10 months. I never complicated matters, and always thanked them politely for their reply and accepted any waiting period.