A blockchain is a linear construction of new blocks that occur at a later time and which cannot be undone. The time it takes to add a block to its canonical chain varies according to the blockchain protocol it was developed. This blockchains linearity serves as an ideal form of block validation. This time to add a new block in the chain is termed as block time. According to ethstats.io as of July 2019, the block time falls within 14 seconds approximately for an ethereum blockchain network.