Disassemble all exists, by clicking disassemble the quantity buttons represent the quantity to disassemble. So clicking Disassemble, then Max will disassemble all items.
If you're using the auto-quest system, quests take twice as long. If it's set to manual and you're getting this problem, that's definitely a bug. If it's definitely set to manual, please let me know, so I can look into it further (I'll still check a little anyway).
I see, I will update the game later today to fix that bug plus improvement on time leap