I don't know of an exact timeframe for it - I think it's pretty variable, but generally, if you take a nap an hour or 2 after waking you should have no problem. 3 or 4 hours is much more iffy, and might already be too late? I would think 5 or 6 hours is way too late. Maybe you should experiment and keep journals so you can work it out, and then you could tell us!
It SEEMS like I've read somewhere that 6 or 7 hours is supposed to be the top limit, but I'm not sure, and I would definitely try to err on the side of less time than more.
Of course it will be different at times depending on your state of health and how well you're sleeping etc. - there are days when I feel sleepy all day and I think I could probably drop straight into REM at any point (I kinda feel that way today in fact, I ought to give it a shot). And if you're suffering from sleep deprivation, you'll be able to hit REM immediately at any time. Though it's not recommended to deliberately deprive yourself of sleep - very bad for your overall health!
EDIT:
Tied it. Couldn't fall asleep. It takes me at least like an hour, which is why naps don't really work for me. Oh well, it was relaxing anyway.
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