Re-certifying income, when to do it?

Hi all, I'm wondering how quickly recertifying income is updated once submitted when I update it on studentaid.gov?

Some background: I have been in a $0 payment with my student loans since 2019, and my recertification date is coming up on July 29, 2026.

Should I wait until July 28th or even the 29th to submit for recertification, or should I do it earlier in the month to give myself a buffer to make sure that it is submitted without getting a penalty? My income has gone up significantly since my last recertification in 2019, and I'm trying to avoid an unnecessary extra month of a high payment.

I know that the Department of Education is more understaffed now than before, so I thought recertifying early may be required in order to make sure It's processed by my due date, but maybe this is incorrect thinking.

Alternatively, I was thinking that as long as the document is digitally submitted on or before July 29th, then I should be good.

I'm interested to hear other people's experiences with this!