I have almost 400 daily dungeon keys. Between all the scrolling to get to them and the really quick time it takes to do 3 runs on autoplay, it's going to take a lot of manual work to burn through them.

Suggestion: Make a "Mega daily dungeon key" that allows you to play 30 times and sell it in the store for 10 regular daily dungeon keys.

That would let me buy a Mega Sands of Time refill, use a key, and let it run for 30 times instead of 3. Would be a great quality of life change, and I'm pretty sure you already have all the infrastructure for doing it.