Sam its not a silly question. After one hour there will not be severe turbulence from the thunderstorm that has passed through however you may well be still under the influence of the unstable air mass or cold front that has produced that thunderstorm so it could still be turbulent and there still could be other large CBs around.
Read this
http://www.ead.eurocontrol.int/eadba...2010-08-12.pdf