I am currently a 3rd year PhD student in public health at UNC-Chapel Hill and did my MPH at UCLA. I can only share my personal experience from these two schools. I will offer some second hand accounts from friends at different schools.
I'm starting my MPH in Epidemiology this fall, after which I'd like to shoot for a DrPH. I was looking at the schools website and all the required DrPH courses are the same as for an MPH except for 30 credits of electives and a dissertation. So how long does it take to get a DrPH? Is it just a lot shorter than a PhD?
Although the courses may be the same, most schools will not allow you to "double dip". When I was debating whether to remain at UCLA or go to UNC for my PhD one thing I considered was whether I could count the courses from my MPH in my PhD; the reason for this was that I could have finished my MPH 2 terms early but simply stayed on for a richer educational experience. I wanted to know if either program would have allowed me to credit my additional units to my doctorate. Neither program would allow me to do this. I needed to start from ground zero as it were. This was true for the DrPH as well (I asked just to be certain; I wanted to be in school for as little time as possible). So my guess is they will do something to make sure you are take enough classes to satisfy the total number of units required (degrees typicall have a minimum number of units required).
although I only applied to one program (UC Berkley DrPH), it seems that almost all of them require post-mph work experience - typically 2 years or more. If you already have an MPH from an accredited school, which is typically a requirement for applying to the DrPH, it should take 3 years to complete the DrPH. For instance, at Berkeley the DrPH consists of:
-2 years of full time classes (48 semester credits)
-One summer of a full-time "professional experience" - basically an internship in whatever part of the field you are concentrating on.
-1 year of thesis work. This can be extended to 2 years if necessary. The specific thesis format required seems to vary between schools.
you can think of it as a traditional PhD (~5 years) broken into 2 parts (2 yr MPH + 3 yr DrPH).
My experience leads me to question the "-1 year of thesis work" comment. From my experience (both personal as well as watching my friends doing a DrPH), 1 year is the EXCEPTION. 2 years for the thesis is the norm for both the DrPH and the PhD. From the experience of all my friends on both degree tracks it takes 1 year to write and defend the proposal and then 1 year to write and defend the final product (you need to remember that you are not only writing for yourself. you are writing to make a committe of typically 5 people happy; they will frequently have very different approaches and outlooks on research. It becoems an iterative process just creating the proposal. Not to mention the whole process of identifying a unique question to pursue, learning methods to address the question, etc...). So I would count on a 4 year program for the DrPH in public health as opposed to 3 years.
Tulane seems a bit different from other DrPH programs that I looked at, but the website does mention that public health work experience is "preferred". Most other programs require a minimum of two years work experience, as the DrPH is training practitioners for leadership positions in public health (this is not to say that research/teaching is out of the question); it's difficult to obtain these positions without having previous work experience beyond the practicum/internship.
As for program length, these seem to vary a bit as well (though not terribly), but I can expect to be a student for the next four to five years - coursework for the first two, followed by research/application/dissertation.
If you really want to apply to a specific program, maybe you could email a faculty member you think you might like to work with (probably after April, in case he or she is part of the admissions committee and is feeling overwhelmed). Someone with an "in" would be able to tell you if you may need to think about working for a couple of years before applying. My only word of caution (and I could be wrong) is that I imagine someone without previous work experience will still have to work her/his way up the ladder...with or without a DrPH.
I hope that helps a bit - good luck!
I think that this in the end is the best advice. Programs will vary. Email both students in the department as well as faculty to get an idea of
1) length of time
2) difference between degrees (In many departments/schools there is little to no difference between the PhD and the DrPH. For instance, in my department there is no real difference between the two degrees except the minor you pursue. This was also true at UCLA). The program website will say the PhD and DrPH is different in this way; practically though when it comes to the coursework and the experience the two end up being no different. Also consider the cost of the 2 degrees. At UCLA the DrPH was considered a "professional degree" and was charged accordingly (meaning the DrPH was quite a bit more expensive than the PhD). At UNC the two degrees cost the same.
Finally, I would suggest downloading the Doctoral handbooks from the programs you are considering. IN the handbook they will have detailed descriptions of the two degrees including:
-coursework (what courses do you need to take)
-exams (written comps, oral comps, oral defense of proposal, oral defense of final dissertation)
-dissertation format (what topics are and are not appropriate for the dissertation)
Personally my opinion (from my experience in the program and from talking with other folks) there is little to no practical difference between the training you receive as a DrPH student and a PhD student at the end of the day. At the 2 schools I have attended the two leave with essentially an identical skill set. And the 2 degrees take essentially the same amount of time. that is simply my opinion though based on my observations at the schools I have attended.