Time off of over a month is a very common practice of many of the world elites from marathon down. I know of many personally that has shared this with me. Many runners are afraid to take the time off as they think this will set them back and or are too unhappy not to persist with the routine of training.
From experience, I have only seen great benefit from my long breaks, especially when training becomes less pleasant than ideal after months of hard work. There is a seemingly persistent accumulation of stress that the daily or weekly easy runs won't take care of. Some systems recover, but the endocrine system seems to have a limit. If one trains hard, there is a point when there becomes a diminished return on the training response. The best response at that time is to stop the training, but I think most are not sensitive to recognize this or are in a state of denial and that continued training will change things.
It isn't fun to not train, but my experience has proved that this is the best price to pay for continued growth in running. Others may disagree, but if one can recognize the insights from the world's best, he or she might consider making it a common practice throughout the year and find it may be the best training decision with the best results to be had.