If the user has a roaming user profile or remote home directory and the network is currently unavailable, Microsoft Windows ...

Windows 7

If the user has a roaming user profile or remote home directory and the network is currently unavailable, Microsoft Windows waits 30 seconds for the network when the user logs on to the computer. Using this policy setting, an administrator can specify how long Windows should wait for the network to become available. If the network is unavailable after the maximum wait time, Windows will continue the log on the user without a network connection. The user's roaming profile is not synchronized with the server, and the remote home directory is not used for the logon session. 

This policy is useful for the cases in which a network may take typically longer to initialize, such as with a wireless network.

Note: If the network becomes available before the maximum wait time, Windows will proceed immediately with the user logon. Windows will not wait on the network if the physical network connection is not available on the computer (if the media is disconnected or the network adapter is not available).
 
If you enable this policy setting, Windows will wait for the network to become available up to the maximum wait time specified in this policy setting. Setting the value to zero will cause Windows to proceed without waiting for the network. 

If you disable or do not configure this policy setting, Windows will wait for the network for a maximum of 30 seconds.

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