How long until the theme/style is updated?

EDIT: OK I figured it out. I was clicking on the picture of the theme I wanted, and that wasn't enough, even though it would show up correctly in the preview! Instead, I had to click on the link to the theme (which is just below the theme's thumb, in tiny font), and this took me to a different page, where I could then enter my forum web site. Very confusing, but it works now. That should be fixed.

Sorry I'm a noob didn't find this answered in FAQ or when I searched the forum. I hope it isn't inappropriate.

I updated my theme/style for my new forum about twenty minutes ago, clicked on theme I want, and 'save settings', but it is still showing the one I'm trying to escape from.

How long does it usually take for the theme to update? It shows correctly in the preview page in my admin panels.

Thanks for any help.

In case it matters, my forum is: http://icsdiscussion.forumotion.net/index.htm

I am trying to change it from floral effect to prosilver.

It should upload it right after you choose it. Try doing it again.