When to delete Assistants API Thread?

Does OpenAI automatically delete Threads after a set time period? Is there a recommendation when a thread should be deleted?

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Currently, OpenAI lists that messages and threads are stored for 60 days, but they include this note:

For the Assistants API, we are still evaluating the default retention period during the Beta. We expect that the default retention period will be stable after the end of the Beta.

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After 60 days if I send new message to the thread the message will accept and start all again if like no message send before or will reject the message?