Treyarch has stated on Reddit that they have increased the revive time for a downed teammate in Black Ops 4’s Blackout mode based on data from the beta.
During the beta, the revive time was 3 seconds. For launch, it will be 5 seconds. Treyarch states that the movement speed while downed is also increased, so an increase in revive time offsets some of the effects of that during a match.
Negative. Blackout was 3 seconds revive in beta and we’ve increased it to 5 seconds for launch. We’ve also slightly increased downed crawl speed. With a faster crawl which allows you to reach cover quicker, we felt a slightly longer revive time was needed. An increased revive time also encourages the use of the Medic perk, which reduces revive time by 50% among other things.