It depends. If you have a reflection in it, or some other detailed shader setting, it will sometimes take a very long time, depending on the size of the output render.

One test I have is I move the cursor to the pop-up and hover over "cancel" on it. If it flickers, then Poser is indeed rendering, but if it remains "solid" then it's stuck.

And remember, sometimes it's your system being pushed to it's maximum memory/page file limits that makes it take so long.

I'm using Poser 6 now, SR3, so most of those issues have been quelled.

-- Jeff