Plotting Interface usage - trying to get more granular (less then 5 min plots)

Not sure if this is the correct sub.

Im plotting interface graphs, im pulling some SNMP direct from some Ubuntu servers with influx DB as well as from Libre NMS that exports to influx as well.

I can only get it to plot at 5 min intervals, and id like to narrow it down to 30 seconds if possible but i cant figure out how?