We know the following:
- Upon mainnet launch, all the tokens are staked (50% CPU, 50% bandwidth).
- Staking for RAM & Bandwidth is effective at least for 3 days.
- A network needs 15% vote of all tokens to be considered the mainnet
- Only after 15% of tokens have voted, "unstaking" is possible
However, I wasn't able to find any information is the three days counted from the genesis block, or when 15% voting threshold is achieved?