I have searched and checked a few other topic, with no result for me.
If I do already have a dashboard, when I save this with a new time range, it will not save this in the dashboard. So every dashboard created, it uses a default time range of a few minutes I believe.
Also in the Configuration tab within System/Overview, I cant find the default time range.
Also done an upgrade in our environment from: 4.0.8-1 to 4.0.14-1 , with same points.
Running on RedHat 7.9