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					Originally Posted by  itimpi
					 
				 
				As far as I kbnow there is no built in limit.  The largest library I have heard of people already having is around 30K books which is quite a large library.   I personally currently have about 9K books in a wide variety of formats (averaging around 4 formats per book) - total size is around 14GB. 
			
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 Yep. Just imported 31222 books, total size 11GB. That took a day (literally; it took almost 24 hours), but version 0.6.49 now starts up in 1,5 minutes and searches take < 2 sec.
The older versions were completely unusable on this machine (1.5GB RAM, 1,66GHz Core2Duo T5500) with only ~20K books in them (last time I tried). Startup took more than 20 minutes and searches took minutes. This with a DB created with a humongous batchfile of 'calibredb add'-commands, as importing through the GUI...welll 
Great job, Kovid!