Valerie, as far as I know, when you sign up for a trial and don't provide any credit card details, the eval period is for 7 days only - however, if you do provide credit card details (which doesn't mean you will be charged at the end of the trial), the period is for 30 days.
If you have any additional questions about this matter, I would recommend you to reach out to the Atlassian Sales Team through sales@atlassian.com.
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