30 seconds
"period": 30,
why-ethereum-transfers-are-so-slow-how-fix
https://born2invest.com/articles/why-ethereum-transfers-are-so-slow-how-fix/
Slow and steady
Ethereum only processes 10 to 15 transactions per second, in large part because all nodes are required to help process all transactions made through the database. By comparison, a credit card company like Visa can process around 45,000 transactions per second.