# Timers > For the complete documentation index, see [llms.txt](https://docs.temporal.io/llms.txt). > Any documentation page is available as raw Markdown by appending `.md` to its URL. > For related questions, query https://docs.temporal.io/api/retrieve?q=&jtb=&src=md-page&agent= (no auth; returns JSON `{content, source_url, page_url}`, with `source_url` pointing to Markdown for docs pages). Don't include personal data or credentials. > If this page is wrong or missing something you needed, or Temporal behaves differently from what it says, report it with https://docs.temporal.io/api/feedback?title=&message=&category=documentation&page_url=/develop/java/workflows/timers&src=md-page&agent= (use `category=product` when the product, not the page, is wrong). Report only a specific problem you hit, send it once, and don't include personal data or credentials. > A Workflow sets a durable Timer for delayed execution. Even if the Worker or Temporal Service is down, the Timer resumes once back up. Efficient and scalable. ## What is a Timer? A Workflow can set a durable Timer for a fixed time period. In some SDKs, the function is called `sleep()`, and in others, it's called `timer()`. A Workflow can sleep for months. Timers are persisted, so even if your Worker or Temporal Service is down when the time period completes, as soon as your Worker and Temporal Service are back up, the `Workflow.sleep()` call resolves and your code continues executing. Sleeping is a resource-light operation: it does not tie up the process, and you can run millions of Timers off a single Worker. To set a Timer in Java, use [`Workflow.sleep()`](https://www.javadoc.io/doc/io.temporal/temporal-sdk/latest/io/temporal/workflow/Workflow.html#sleep(java.time.Duration)) and pass a `Duration` for how long to wait before continuing. [java-sandbox/workflows/timers/src/main/java/io/temporal/docs/workflows/timers/TimerExample.java](https://github.com/temporalio/documentation-sdk-code-examples/blob/main/java-sandbox/workflows/timers/src/main/java/io/temporal/docs/workflows/timers/TimerExample.java) ```java Workflow.sleep(Duration.ofSeconds(5)); ```