I cannot seem to get this to work. I'm using jDownloads Version 3.2.62 on Joomla 3.8.10. Actually, I am using a user which belongs only to the Registered group. When I change the first few settings on the User Groups Settings for the Registered Group, these settings are taken into account. I think I got as far down as the daily megabyte limit. However, from the weekly megabyte limit downwards, the settings don't seem to be taken into account. This includes the Download Duration parameter. Also, I wonder what the default value for the Download Duration really is, because it seems that even when I try a repeat download after more than 60 minutes, it still isn't logged.
Of course, it may be that I'm just doing something wrong. It wouldn't be the first time. (By the way, I can't seem to introduce carriage returns in this text, sorry!) Alan