The valid time period for the 'Aqeeqah sacrifice
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Question: Is the duration [within which the] 'aqeeqah [is to be carried out] a week, two weeks or 21 days as is said? And is it correct to slaughter the 'aqeeqah on the 9th or 10th day for example?
That which is best is for it to be [carried out] on the 7th day as occurs in the hadeeth. And if missed, then the people of knowledge have mentioned that it can be done on the 14th day; And if [again] missed, then [it can be done] on the 21st day. Thereafter, not to be pursued weekly [such as on the 28th day or the 35th day and so on]. And this [recommendation] is [only] from the aspect of that which is best. So if he slaughtered it on the 6th, or the 5th or the 10th or [even] the ninth day, then there is no harm in that.
Shaykh Ibn 'Uthaymeen
I'laam al-Mu'aasireen bi-Fataawa Ibn 'Uthaymeen - Page 191