Today I finished 海辺のカフカ（上）. I only started recording my reading time from page 155 onwards, sadly. Here is the reading time for everything I read everything whose reading time I recorded (I’m missing maybe 2-3 hours of manga reading in here) in that timespan:
For カフカ, this equals an average reading speed of 9.6 pages per hour. I suspect this is rather thanks to Nakata than to Oshima, though 
Anyways, if we assume that I read the first 150 pages at the same speed, then it means that it took me about 50 hours (across 38 reading days) to read the whole book.
Next plans are Flesh&Blood vol. 3, and Kafka part 2 from Saturday.