Hi ​@Kaori Yajima 
Thank you for reaching out, and welcome to the Docusign Community! We appreciate your question and assure you that we are fully committed to providing you with the best service possible.

By default, requests to sign or view expire 120 days after sending the envelope. You can modify this value as needed. You can also add the option to send signers an expiration warning.

Docusign recommends that you enter a low value for the option Days to warn signers before expiration, such as 3 days. Warning signers of an expiring envelope improves the outcome of getting envelopes to complete instead of expiring.

When an envelope expires, the status changes to Voided and it can no longer be viewed or signed by recipients.

When an in-process envelope reaches six days to expiration, a warning icon displays and the status shows "Expiring". Hover over the status to show the expiration date.

You may check these relevant articles.
Envelope Expiration
Do Docusign envelope notification emails expire?

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Ma. Cassandra | Docusign Community Moderator
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Hello ​@Kaori Yajima 

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If you run into any problems, we're happy to help with those here. Wishing you a smooth rest of your day!

Ma. Cassandra | Docusign Community Moderator
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