To find information about the fines imposed on validators and the duration of the rounds in the TON blockchain, you can refer to the configuration parameter number 40.

In the Testnet, you can access this parameter through the following link:
https://test-explorer.toncoin.org/config?workchain=-1&shard=8000000000000000&seqno=10476790&roothash=6D2228626EC81D680F9CD0AAC0CDC78B8D0B63A88AAB95395576E46E65F4B5F9&filehash=C4F8F113C7B4F09BBA11D8EBB08E89E11E02172A11D6B5CA74339FFE548D98A5#configparam40

Config parameter 40 controls the recommended punishment fines for validators. However, it's worth noting that the Mainnet may not have this parameter set explicitly. In the absence of config 40, the default fine for validators is 101 TON.

As for the round duration, the TON blockchain does not have a fixed round duration specified in the global configuration file or whitepapers. The round duration is flexible and can be adjusted based on network performance, validator performance, and other factors.

For the most up-to-date information on validator fines and round duration, it is advisable to follow the TON community forums, technical documentation, and the official GitHub repository for the TON project. This way, you can stay informed about any changes or updates related to these aspects of the TON blockchain.

For more detail about validator config, you can check:
https://docs.ton.org/develop/howto/network-configs