Hi Nardus,
I guess you can only pull the reports stored on the controller.
Log details depends on the system resources (CPU and memory) that the virtual machine running the vSCG has. The vSCG is capable of automatically storing a higher number of log messages if there is sufficient CPU and memory on the virtual machine.
At a certain level, vSCG will start deleting the oldest entries to make room for the newest.
The log entry does not depend on the date, it is the number of the entries.
Please check the below link and refer from the page 36 for the "Preserved Logs" which tells us the max entries the controller can store depending on the capacity.
https://support.ruckuswireless.com/documents/2958-smartzone-5-1-2-0-302-mr2-release-notes/download