How long should you wait to feel the effects of a percocet after taking suboxone?

my psychiatrist gave me Suboxone 8mg/2mg , I also take Vicodin 5/500mgs for breakthru pain, is this safe?? and how long do I have to wait to take a vicodin, well, actually it would be hydrocodone the generic for the vicodin, to work on my pain??