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On some implementations, the OSPF dead interval can be set to one second or less, with correspondingly short dead intervals.

From

Cover of CCDE Quick Reference

Note

Dead Interval >=1 Sec. In this case "hello-multiplier' will decide number of hello packets sent per second i.e. effective hello timer would be 1/hello-multiplier value. in below case Hello timer would be 200 msec.

ip ospf dead-interval minimal hello-multiplier multiplier
Example:
Router(config-if)# ip ospf dead-interval minimal hello-multiplier 5