Im nearing 60 hours and still only have 1 DB.
I am right next to the second and each time i say "ok this time I will go for it" and I end up getting side tracked doing shrines, seeds and side quests.
I THINK, FINALLY, I will go for it tonight.
Same but I have two DB. I'm literally right at the end of the quest line just before triggering the actual DB in the third area and I've been distracted by grabbing the master sword, and then looking for things to upgrade armour. And then I found Kass's diary (should I make a note or do people just go back after side quests and check the next one??... still haven't done that third DB after about a week of being on the cusp.