Execution times can vary based on the conditions of the network. Most transactions can be completed in minutes or even seconds. However, some coins like bitcoin are dependent on receiving a confirmation. When a transaction is broadcasted to the network, it has to wait to be included in a block by the miners. Once a transaction has been included in a mined block, the transaction has received 1 confirmation. Each block is found at a different rate depending on the blockchain. However, sometimes it can take Bitcoin miners 30 or even 60 minutes to mine a single block (1 confirmation).