@Paul486 Are you asking how you can determine how many days you have already rented and therefore you can deduct that number from the 60 allowed? I don't know of a setting that shows the number of days but you could figure it out by looking at past reservations and determining how many days each reservation.
That being said, I believe Air BNB has a contract with Amsterdam to not allow future reservations if the number of days exceeds the 60 day limit. If so, you could Twitter Air BNB and ask the same question. This host forum would not have access to the information you seek.