Bit Coin Mining and the Hash Rate

hash rate is estimated based on the block times and the network difficulty. The current one right now, we estimate it based on one day block time. And that's that can be just a matter of luck. Sometimes miners will find blocks faster, even if they don't have more hash rate.Sometimes it'll be slower, which is the same reason that mining pools don't always find bocks. But at the end of the day, all those hash rate estimates, regardless of the time period, are just an estimate.