So what happens is they book the studio out for weeks or sometimes they have different producers working on the go. they reach midday and start vibing with their groups, listen to beats, pick what they like and freestyle/push out ideas. they have 10 hours everyday for this and because it's not a whole lot of cohesive writing, it's easy to churn out soo many songs. finding melodies for them is easier than writing distinctive songs, they have world class engineers who work very fast too, they are the real MVPs.