[teija]

I was actually trying this out last week. I had a book that according to Overdrive should have expired some time in the afternoon one day. On that day I hadn't finished the book, so when I got home I checked and I was still able to access it. I read it all evening, and finished around midnight (I think I technically may have been a couple of minutes past). From what I could tell, as long as I was actually IN the book and didn't shut it down I was allowed to finish reading it - i.e. it may not boot you out if you go over your time limit WHILE you are reading it (but I would have to test this again to be certain). Once I closed the book and tried to go back into it, I could no longer access the content.

So, to answer your question directly: A book which is expiring via Overdrive/Adobe will stop working at the date of its expiry even if you don't sync or have Wifi on, as it appears to be connected to the date/time in the device.