This call is relevant for real-time users only. The request to get the users' instantaneous power data series for a certain datetime range and sample time for a real time meter.
The interval determines with which sample time the power should be reported (average).
When the combination of date range and interval leads to an estimated number of results over 8640, the start of the date range is adjusted to stay within this limit of 8640.
This allows for 10s samples for 24 hours, or over 2 hours of 1s samples, which should be sufficient for all purposes.
Please note that even 8640 results requires gathering and sending a substantial amount of data (430kB) that takes noticeable time (response time 1-2 seconds), so it is wise to keep the requested range as small as possible.