How long does it take to show receipt of paperwork on the va side?

I was given 30 days to return paperwork to the va. I mailed it to the claims intake center P.O. Box on December 13 with tracking (they got it the 16’th) and somehow it disappeared on their end. After multiple calls I was told to fax it. Luckily I’d made copies.

I faxed it yesterday and called today to confirm they’d received it and the va rep said it’s not showing up in the mail portal, so I should call back tomorrow, the next day, etc until it appears. We confirmed the fax number was correct, I waited 10 minutes at the store to confirm the fax had gone through from my end and have the receipt, so they definitely got it this time. Again.

Does anyone know how long it takes on average for them to take a fax and enter it into the system?

Edit: I figured out how to submit using the “quicksubmit” option through the va website on my pc, so I sent a pdf & hope now they have that copy too, lol