As I recall your previous posts, your organization is small, newly registered to ISO9001:2000, and you have recently been through an intense situation over key performance indicators, compounded by a diffence in focus between you and your general manager. Those are certainly complicating factors for a Quality manager who wants to take a leave of absence.
Since your organization is small, I'm pretty sure you don't have an assistant who can tread water, deferring any major issues until your return, but able to take care of all day-to-day operations.
The question arises, "Will you be completely unavailable for consult during your leave or will you be available by phone or email, perhaps even a short term on-site visit?" If yes (unavailable), the problem is compounded by finding someone competent and willing to work only a short term and then relinquish the post back to you on your return. Let's leave that issue until we get confirmation from you.
If you are able to consult (say within a day or two of an issue arising), you can probably elevate someone to assistant status to care for day-to-day stuff and call you when anything unusual arises. A big issue will be getting agreement from general manager to call you in for issues and thus keep your spot open for your return. The assistant should be getting temporary bonus pay during your absence, reverting to standard pay on your return.