Increase aws appsync time out.

The docs tells us that we can do an asynchronous request for appsync. But I am building a web app with LLMs with langchain agents. Which takes almost a minute to load. Is there a way to increase the waiting time for this requests? Or should I just move away from appsync and use a separate backend which makes my codebase a too convuluted.

Start with the AppSync documentation on asynchronous requests and the timeout behavior for long-running LangChain agent requests. Determine whether AppSync exposes a supported way to increase this wait time or whether the request must use a separate backend; done means documenting the applicable limitation and recommended direction.

Written by the indexing model from the issue text.