V2 Limit the maximal datablock time

[yoelk]

Some controllers (like Arduinos) can only count using 32bit variables.
If they're counting milliseconds, they can count until ~50 days.
This means that if we want to allow longer operation times, we should reset the mutual time once in a while (every day should be more than enough)

• This has to be checked for every supported controller. if some controllers have less than 32bit variables or if they count microseconds, another update frequency is needed.