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A regular novel of about 90 000 words takes about 5 or 6 hours to read end-to-end. That is, if you count all the time you spend reading, that's what it will add up to. Which means a lot of reading and a lot to remember.
Read-in-One-Sitting books are those you can read in one train ride, say. Or one visit to a dentist's waiting room. Or one stand in a long queue, or at a bus stop. They are books you can load onto your portable device, and enjoy in one hit. One lunch-break, or one ferry trip. How neat.
They are becoming quite popular, because they are cheaper than the regular novel. Some even come free. I have three of these Read-in-One-Sitting books up at SmashWords, at the moment, and they are all free. I am testing the market. You are invited to download them here.
How did I make them? It was not that hard. I used to write a lot of short stories in the past, and they were published as collections which have gone out of print. So I found four stories, and bundled them in pairs that seemed to go well together. I also found one of my old historical novellas that was under 20 000 words - which means it's easily read in under an hour. Great.
So I had two bundles of two short stories each, and a novella. I formatted them properly, following the instruction manual at SmashWords, uploaded them, and made simple covers using patterned wrapping paper and a bit of typography.
Can you do the same? Probably: look through your old files and find stories whose rights are entirely yours. Give them a good edit so that they feel fresh, correct and very readable. Make sure that the wordcount of each eBook you make is under 20 000 words. Read them aloud while timing yourself. Each book should not take longer than about 20 minutes to read. Just the right length for a commute, a long wait at the doctor's, or that lag time between lectures.
Decide how you would like to go: Kindle? Read the instructions at Amazon. SmashWords? Read their manual. Formatting for these two is rather easy - there are others that are slightly more complicated.
Upload your eBooks after you have made yourself some covers (preferably a bit better than mine!) and try to price them within reason, always remembering they are only little books that take no time to read and enjoy. If you realise that they make excellent 'tasters' for your kind of writing, you can use them as freebies to excite readers about your work. They might then purchase your longer works more eagerly.
Making these short Read-in-One-Sitting books becomes easier the more you make. You might find your readers coming back for more.