I generally load up 10-20 and most I've ever added in one go is 60. I don't tend to have a lot of books on my ereaders, but when adding bunch I just think 20 is a good number to add so if there is ever any problem with indexing, its easier to see where the problem book is. Don't really see anything wrong with people wanting to add 100 at the one time though, just keep it charging so your battery doesn't drain.
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