Just like the Java language, you can write your class definition and create as many objects as you want using the same class definition. Similarly, Solidity has smart contracts, in which you write the definition of the contract. When you deploy the contract on a blockchain, a public contract account address is generated and assigned to it. You can deploy as many contracts as you want with your contract definition on the blockchain, and each deployment would create new contract instances on the blockchain, each have unique contract addresses. Your application design determines whether you want to deploy multiple contracts of the same contract definition or not.
Note that contracts do not have the cron-like functionality necessary to auto-trigger a transaction from a contract at a given time. A transaction is always initiated from an EOA account.
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