How long do my parents have to wait to file, because I didn't say on my taxes that I can be claimed as a dependent on there taxes,

[xmasbaby0]

They do not need to wait because they will never be able to e-file their 2021 return now even if you amend.   They have to print, sign and mail their return.   Your SSN is in the system and it will be months--months---before the IRS processes your amended return.  The ONLY way they can file is by mail.

Meanwhile. after your return has been fully processed then you need to amend and change the way you answered the question in My Info for whether you can be claimed as a dependent.  And...if you got the $1400 recovery rebate credit as part of your refund---you will be paying it back.

[DoninGA]

Have you amended your 2021 tax return to change your dependency?

An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 16 weeks or longer to process an amended tax return.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.

See this TurboTax support FAQ for amending a 2021 return - https://ttlc.intuit.com/community/tax-return/help/how-do-i-amend-my-2021-return/00/2544441

Your parents will have to print and mail their tax return since the IRS has received a tax return with you as the taxpayer and not a dependent.  You filing an amended return will not change the IRS database to accept your parent's e-filed tax return.