Data point:

I requested a price match for a hotel I booked through the capital one travel portal (within the 24 hrs window) and the request got approved in 2 hours.

“We've processed your request to match a lower price on your booking. You’re getting a refund of ($xx) to your original payment method. This should be posted to your account within 7-10 business days and you will see it on your statement within 1-2 billing cycles.

Thanks for being a Capital One customer!”