System Monitor (is it the day's activities or another range?)

So I added System Monitor integration and added Network In and Network Out to a dashboard so that I can see how much data HA is moving on the network. However, what’s the range? Is it in total since being added to the dashboard, is it the last 24-hours, the week, the month? It doesn’t say. It has been counting up since about 4PM yesterday. I wouldn’t mind added 24, week, and month to see all three values, but even just the one value is awesome (as long as I know what it represents).

It is probably just counting up until the counter reach it’s max and then it starts from zero again.
This is actually the best way, because you can then decide what you want to do with it.
You can store a value from a sensor and 10 seconds later read same sensor. Now you have a time interval and a start and stop value, so you can calculate it’s bandwidth utilization.
The issue here is that the time between the two read outs can not be larger than 1 below the time it takes to reach the max sensor value from 0.
If it is longer then that you do not know if zero or not.