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					Originally Posted by  itimpi
					 
				 
				However a word of caution - a conversion can take a long time.   Minutes is not unusual, and hours have been known. 
			
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 Pardon my saying so, but that's just wrong; if conversions are taking that long then Calibre seems to have some performance issues that need resolving.
I think I'll stick with providing the user with an opportunity to download all the html source in a zip file.  I'm parsing it, expanding custom tags, and lots of other things in about a second, then storing the completed file for download when requested.  Minutes?  No, thank you.