Duration for a new zoneinfo file

[Rest Matthias]

Hello,

At the moment we have the situation that in the country of some customers
the head of these countries decides to change the time/date for changing of
winter/summertime.
Now I would like to know how long it would approximately need until a new
zoneinfo file is created after you received a message that there will be a
change?
This is important for us, because SUN is using your zoneinfo files as input
for JAVA which we are using.

Thanks for your help.
Kind Regards,
Matthias Rest