Leela zero (the main alphago zero replication project) is a crowd sourced computation effort that's going to take a fairly long time to get anywhere.
And from this paper: > "Training proceeded for 700,000 steps (mini-batches of size 4,096) starting from randomly initialised parameters, using 5,000 first-generation TPUs (15) to generate self-play games and 64 second-generation TPUs to train the neural networks."