How can professional writers write a book in less time?

I started writing a book a year ago but have only been able to write two chapters. Moving to California for my studies has been a tough job. But I really want to get my book published as soon as possible. I am excited about writing but haven't been able to take time out. So, I was advised by a friend to contact a professional book writer in usa whom I can trust with my book. Will these professional book writers be able to complete my book in six months?