I have no idea honestly. I haven't learned/revised any ZBLLs since like October. I'm also not planning on doing so in the next few months, because I decided to prioritize full floating for 3BLD (i want a sub 20 official single).
(Annoying character limit)
In June or July I'm planning on grinding ZBLL because my final exams will be over then and I'll have a lot of spare time. I'll probably dedicate like 3 weeks to learning and 2 weeks to revising everything, I expect that to be enough.