For the second round, 1 BTC will give 62.5 MB so 70 000 BTC will give 4 375 GB and the 100 000 GB already distributed will give 10 000 GB so that's 14 375 GB in the second round which is like 1.5%. In the subsequent rounds, 1 BTC weight will decrease so 1 BTC will give less bytes, it seems that the majority of the distributed bytes will come from already distributed bytes. Hopefully, way more BTC would be linked in the following phases. If we assume that 1.5% is distributed at each round, the remaining 88% will take almost 59 rounds, if we assume they are 1 to 2 months apart then this takes us to 5 to 10 years.