I can't fully explain it myself because I haven't completely internalized it yet.
The energy integral is based on the difference between the target supply temperature and the actual supply temperature (sometimes also called degree-minutes).
The compressor/heat pump starts heating at -90 minutes. If the system eventually stops delivering heat because the rooms have reached their temperature, the actual supply temperature rises above the target supply temperature; this difference, let's say 1.5 degrees, is then a so-called degree-minute.
These 1.5° then tick down every minute from the set -90° until, for example, 0° is reached, then the system switches off.
If the reverse situation occurs, the target supply temperature drops below the actual supply temperature and goes in the other direction until at -90 minutes the heating starts again.
Additionally, there is an extra protection called compressor hysteresis, for example 3K, when the actual supply temperature rises quickly. Then the compressor switches off when the actual supply temperature is 3°C above the target supply temperature.
In short:
A high compressor hysteresis leads to a longer running time of the system (mine is set to 15°C or Kelvin).
An increase in compressor start time also leads to a longer running time because it simultaneously takes longer for the system to start and stop working. For me, 120 minutes.
I hope I was able to explain it somewhat; whether it is 100% correct is another matter. I'm not a professional.