The Timed quest "Bandits in the Perimeter?" requires you to defeat 650 bandits in 10 minutes. This is impossible for me. I only defeat ~635 in 10 minutes. I have tried several times, and I still failed the quest. Please change the amount of time to complete the quest from 10 minutes to 15 minutes. This will make it easier for me and other people to complete the journal. Right now, it is impossible. I also one-shot the mobs btw.

Just keep trying.  It took me 3 attempts to finish it. It is important to find the best rotation where the mobs are close to each other and also that there is not another player killing the mobs, because then you won't make it. 

Oh and also, if you really have problem with completing it... ask someone to help you. It works in party, So party kills will count :) 

Try 5 times, no luck. You should make the time into 15 minutes. That will be easier for a lot of people.