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.
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.