Count consecutive days of absence

Hello everyone
I am trying to create a formula that will count the days of absence for each person, but only the days of continuous absence.
In the first column :person number,
2nd column: starting day ,
3rd column: end day

I've tried to do this with formulas, but i was able to find max/min date, but the point is to count consecutive days. I
maybe it's posibble to do this in power query ?
I will be grateful for any tips.
in attachment sample data.


Best regards,
Mark


PS. Merry Christmas