Not sure if any reviews have mentioned a hard number. It's something that is inherently difficult to pin down due to a number of potential background tasks running at any given time, such as syncing iCloud Drive photos or refreshing a news app in the background.
That being said, probably quite a bit more. It will probably still eventually refresh or have a crash, but it's probably far less likely to happen now from normal use, like just visiting a site like theverge.com lol.