Length of a novel... Do ebooks have to be the same as printed works?

My current novel is going to work out at around 80,000 to 90,000 words long.  I'll be publishing it on Kindle probably.  Typically novels can be up to half a million or so words in length.  But do ebooks have to conform to the same conventions?

I can not imagine reading a long piece of work on a mobile phone.  I'm not sure what researchers have said about the maximum reading length for ebook readers or computer screens. I am guessing that eink displays may fare better than radiated light screens but there is probably an argument to say that ebooks may need to be shorter than their printed cousins.

Maybe the typical ebook 'novel' will be of the order of 40,000 to 60,000 words? I am not sure if this format would work but I may experiment in this direction.

After all, does anybody really have all the answers?

Latest writing

Two chapters written this week.  I have also spent today brainstorming new ideas for short stories and possible future novels. 

Coming up soon is the publication of 'The Coming of the God' which I am going to put on Amazon.  I will have to charge a small amount for it but hey, its worth it! (at least I hope so)

My next short story will either be a parody of local government or a serious political piece (fiction of course!)