Though there are exceptions to every rule, “best practices” are commonly followed with reason. As an author you may be genius, but a true genius comprehends the entire process, rationalizes boundaries, and knows when to break rules to achieve specific results. In the publishing world, you really really really need to be professionally respectful of the person who may reject your hard work. If you don’t “fit the bill”, then you may end up not able to pay yours. Below is a guideline which details the word count generally considered as appropriate per genre.