It appears that you site is undergoing maintenance. As the message shows you can learn more about the maintenance windows by reviewing the document accessed through the "Maintenance Windows" link in the message.
I cannot supply you with an ETA. I am just another user of the Atlassian products.
The document for Maintenance Windows says what the normal maintenance window duration is.
If you are using a paid subscription, your administrators could try opening a support case directly with Atlassian. The maintenance might complete before you get a response.
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