Marathon training question

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Hi all!
I'm currently at the end of training for a half marathon. If I had to run one tomorrow I'd have no issue doing so. I would like to train for a marathon but I was wondering if I should take a break in training before then? The marathon I'm wanting to run is at the end of October. If I started training this next week I would be done in time for the marathon.

Would you take a break between training plans or just jump right into marathon training?