It's called variance, you can't beat it. This is why block times are so irregular at times.
atleast this guy gets it
i laugh that the OP cries that 313799 took soooo long. but did not shout out with excitement that 313798 only took 3 minutes or that 313796 only took 7 minutes.
doesnt he realise that before the last difficulty change, the average was way below 10 minutes. So this fortnight the difficulty has been ramped up soo high to make the average above 10 minutes, so that the average balances out to stay as close to 10 minutes as possible. but even with such a high difficulty, some blocks are still happening in under 10 minutes.
even as i write this, block 313806 took only 1 minute! 313808 took only 3 minutes