I just want to know what is difference between invalid timer and holddown timer in rip protocol

I know that
Update timer is 30 sec
invalid timer is 180sec
holddown timer is 180
flush timer is 240 sec
so when invalid timer finish at 180 sec after that hold timer starts , Does this mean hold timer is actually valid for 60 secs because at 240 sec router will flush the route with metric 16 hops


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