for the recently concluded exam, the results would come out in 3-4 months time due to the very huge number of examinees. this is what happened for the previous batch (exam: june 2007; results: september 2007).
as for the other batches, if the listing is not in the prc website, you can try manila bulletin or the inquirer's website.
usually 3-4 days after the exam may result na. but because of the vast numbers (>40,000) who took the nursing exams, the prc does not have the necessary logistics to complete the task in less than a week.