DEFINITION of Block Time (Cryptocurrency)
BREAKING DOWN Block Time (Cryptocurrency)
In simplest terms, the block time is the time needed to generate the next block in the chain. It is essentially the time the blockchain miners need to find a solution to the block hash.
However, the precise time to mine the next block is unknown. The real time taken for block generation may vary around an average value, depending on mining difficulty. (See also, Bitcoin Vs Ethereum: Driven by Different Purposes.)