Period defines reindex period.
The time parameter understands this format:
xxxA[yyyB[zzzC]]
where xxx, yyy, zzz
are numbers (negative numbers are allowed), and A, B, C
are interval specifier characters as follows:
s - second
M - minute
h - hour
d - day
m - month
y - year
Note: The specifier characters are similar to format characters used by the
strptimeandstrftimeC functions.
If the time value is put into single or double quotes,
spaces are allowed between xxx, A and
yyy, and so on.
If you specify only a number without any characters, it is assumed
that time is given in seconds.
The default value is 7d (one week).
Period can be set multiple times and has effect on all following Server and Realm commands until the end of the configuration file, or until the next Period command.