The last book I did this with was "Permutation City" by Greg Egan. There's probably less than an hour's worth of reading left, but I just don't want it to end. This was maybe a year ago and I still haven't touched it since. Eventually I'll probably re-read it from the beginning and actually finish it.
I also do it for bands I really like that are slow to put out albums. I haven't heard the latest GSY!BE (from early 2015) yet, not because I don't want to, but because who knows if they're going to go through another 13 year gap between albums! Maybe in 2020 I'll be having a really bad night and 40 minutes of "new" music from one of my favorite bands is exactly what I'll need.