The news of actor Keisha Castle-Hughes' engagement following a six-week romance was interesting to me. Not because I doubt (or am particularly invested in) the strength of their relationship - how on earth would I know - but because it raises the issue of relationship timing. And quandaries like: how much time is appropriate before an engagement? How long should you be engaged? Does a quick engagement spell disaster? Will he leave dental floss in the sink 4EVA?