If there's no one else farming then you can get 50+ materials in 10-15min. The problem is when others are farming the chests dry up. And you don't have to do them all at once. Just spend 10 minutes here and there farming or when you're doing bounties. I honestly never have an issue with farming for materials. I guess my tolerance for tedious and boring is higher than most
I need to go farming with you. I have upgraded so many things and farmed so much, and watched all the videos, and tried all the techniques, and I have never gotten "50+ materials in 10-15min."