Gave myself a target of 70 books this year and I’m at 68 now and will finish a book in a day or so. But I did notice I was looking at how many pages were in a book and how long that was going to take to read and put bigger books on the back burner. So next year I’ll halve it and be more inclusive of the bigger tomes.
I have a Kobo and use calibre to manage my books. I don’t sync online it’s just plug and remove what I have read and upload my next lot of books that I want to read. My Kobo currently has around 300+ books on it at the moment so I can read whatever I feel like it. Doesn’t help your syncing between different devices but I guess you could us Dropbox or something like that to link up your phone, tablet etc.
I must admit I’m struggling to read for anything longer than an hour at a time so I think I like the idea of reading larger books but in practice it might not pan out.