There is no easy answer to this question, Alyssa. One book might take a year to produce while another is designed and printed in three weeks. It is sensible to allow at least three months for the process – six months is even better. And before all that, you need to write the book!
These are some of the steps involved in producing a book, which will give you an idea of how long the process is likely to take from start to finish. Take a look in: