The ratio between propagation delay and block interval

The ratio between propagation delay and block interval

Is there a certain website or a study that gives an estimation for the ratio f = Propagation Delay/Block Interval for the Bitcoin network ? I know the Block Interval is roughly 10 minutes however, I don't know the propagation delay. I define it as the time it takes for all nodes to hear about a mined block after it's been broadcast.

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