how long can a fsmo role holder be down

in a microsoft 2003 R2 standard domain with multiple DCs what is the max length of time the FSMO role holder can be down before the domain begins to experience issues.
power failure and during the power up process the FSMO role holder experiences trouble returning to normal operations.  How long will the others DCs in the domain and the domain itself continue to function normally before the FSMO role holder is missed?

Thank you very much in advance for you answer.
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Glen KnightCommented:
It depends which FSMO role it is, see here for a good run dwn on the roles each FSMO role plays:

If the server is going to be indefinately unavailable then simply seize the role from this server.  The downside to this is that you will need to format and rebuild the server you seize the role from.

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It really all depends on the fsmo. See article below.
if you are worried it will mess something up, just transfer the FSMO role(s) to a location where the power failure is not going to effect. Then later you can transfer them back to the server you want.
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