Not by much, if you really hate it then leave it. Your reason could be you left due to career progression - but I would advise you to look for something ASAP then. You could also say you've done work experience at xyz to improve your chances at getting another job.
does this employer take people on to their books regularly ?
do they advertise other roles in the business ?
do you get on with the team leaders / supervisors / ops managers ?
do you get given any responsibility? Have you put yourself forward for responsibilities?
what have you learnt so far ?
what has it taught you about how to manage people or how NOT to manage people ?
to be honest my opinion would be that you should stay in the role... you may be asked why you left and employers probably wont like your attitude towards your current job (regardless of whether it is justified!) as it doesn't show much commitment, determination and resilience
you can keep looking for other non-grad roles too?