Flexible Interval - Channel Meaning

Hello!

I performed an oil change on my vehicle 3000km ago and reset it using VCDS in the routine. Everything is fine. When I look at the currently read data, I have a question about the meaning of channels 49, 50, 51, 52, 53, 54 and 55. Are these channels for fixed intervals? Do these also constantly change depending on time and distance, but are not read out by the control unit because it is coded for long life? Or what exactly is behind it?

Greetings
Brezelmann