Yes, you can choose when you work on your tax return and come back to complete and file when you're ready. Just remember when you come back, make sure to use the same User Id and password as you used to start your return. That way you will pick up right where you left off.
Please see the below TurboTax help article for information on important dates and deadlines for the 2021 tax year.
Tax Year 2021 Calendar: Important Federal Dates and Deadlines
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