It can take well over a year for an agent to review a submitted manuscript; some will not reply / reject AT ALL. Reports I receive from writers suggest that the latter is a growing trend, and agents' silence is the answer: rejected.
It reiterates the importance of querying and submitting, or what the industry refers to as -- simultaneous submission. Writers who want to be published have no choice but to disregard the 'no simultaneous submissions' stipulations that so many agents add to their submissions policies. Waiting a year only to hear 'no thank you', or not to hear anything, means no book deal in a writer's lifetime.
The process of querying and submissions is potentially disastrous -- writers become so fixated on the reasons why agents aren't responding that everything else gets thrown aside. Big mistake! It is important to realize that ALL writers receive rejections, even the already published ones.
My advice is to find a way to steer your mind from the dark thoughts, and one of the best ways is to write your next book while you await responses. The creative process will take over, with querying and submitting the previous book being only incidental, or the business side of being a writer.
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