I am a big fan of Connie Willis, and I have read much of her work. I prefer her concisely written stories, such as Lincoln's Dreams, but I can also enjoy her longest winded story which spans Blackout and All Clear. Still, I am torn in my efforts to judge it: is it too long? would it be better if shorter? I am tempted to say 'yes', but I don't know. I only know that I did enjoy it and the writing was so good that I always felt engaged throughout the long running story. I'm just glad I could find the time to finish.
If you don't have much time, then save this one for later.