Failover time to slave nis server?

Let's say I have 3 linux boxes -- a nis master server, a slave server,
and a client -- where everyone knows about both servers (even the
ypservers map knows about them). Now, I pull the ethernet plug off the
master server. How long should I wait until the client starts using the
slave server? What would affect this time if they are all in the same
room and connected to the same switch?
--
Mauricio raub-kudria-com
(if you need to email me, use this address =)