Not if you give three months notice.If you are applying for other jobs in a year's time then they will likely be at the graduate level still. Therefore you'll have until the following summer/September to resign from your current job.If you are applying for new jobs after more than a couple of years of experience, you will likely be looking for an experienced hire position. These more often have immediate start dates so the new employer will be keen for you to negotiate an earlier release date. In reality, this is unlikely to be an issue as few companies are so reliant on their graduates as to be unable to replace them within a month. Obviously, all this depends on the bouyancy of the market at the time.