> Are you talking about OSPF reconverge time it the situation? 
> If you are,
>   the answer is 4 x OSPF hello timer configured on interfaces.( by
> default: 40 secs for  broadcast-multiaccess and 
> point-to-point and 120 secs for NBMA links).

Plus (worst case) the LSA origination timer (default: 5 seconds) + LSA
flooding timer + SPF interval (which could be exponential, default maximum
value is 10 seconds). In most cases, unless you've tuned your network, you
can add a few seconds to the hello timers calculation due to initial SPF
delay (default: 5 seconds)

Ivan
 
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