Six novellas, roughly 30k -40k each.
The way the OP phrased this I think it may be another case of someone thinking "e-publishing" means self publishing.
So anyway OP a number of the people who have answered you in this thread like beachgirl may are talking about e-books they had published with digital first publishers.
Me...not much I guess. I have one full length novel published by Samhain, paranormal, 62,000, one 14 thousand word novella published by Freya's Bower (historical, paranormal) three 4000, 8000 word short stories published in anthologies and a number of stories ranging from a 400 word flash fiction, and 15000-8000 words were published for a flat rate price in an ezine which was a subscription only (people had to pay to read the illustrated stories, but unfortunately that ezine died with the recession. It was a good market for writers called Ruthie's Club.
I haven't self published anything although I read some tempting stories of good money but I'm more focused on digital first publisers. At the moment I'm just trying to write something else hoping my editor from Samhaiin might be interested.