seeker333

I suspect this varies significantly by individual, so bear in mind relative to my following comment.

Back when I was bicycling >25 miles a day 5-6 days per week, I definitely noticed a decline/loss of fitness after only a one week break. It was not like starting over from nothing, but I think my pace/time was down 10-20% from taking a week off, and required another week or so of bicycling to recover and get back up to speed. I think your concern about a month-long break is certainly valid. If there's nothing you can do about it (substitute walking/running), then there's no point in worrying. Try to not gain weight during the break, since it'll probably make the situation worse.