oneThis plural form is used for numbers like: 1
Expires after %1$d occurrence
otherThis plural form is used for numbers like: everything else
Expires after %1$d occurrences
Expires after %1$d occurrence
Expires after %1$d occurrences
Expires after %1$d occurrence
Expires after %1$d occurrences
%1$d - total number of occurrences scheduled, %1$d may be skipped for singular if translation looks better.