You might Google "Training Load", or flip through pretty much any endurance sport training book, for more information. The idea is to quantify your exercise in duration*intensity, and then track that to see the cumulative effects. You can have a load low enough that you can maintain it daily, or high enough that you need to take a day off every other day, every third, etc. If you're just trying to lose weight, then maintaining a consistent load and eating what your body requires will do it. If you're trying to get stronger/faster, then the theory (at least of many books on the subject) is to change the duration and intensity (independently) over time to stress your body, as well as allow it to adapt to increasing loads. The efforts required to get stronger/faster are likely to require more rest than one week every two months.

Ten years ago I ran almost daily, and it took work not to get too skinny. Ten years later, married with kids, and not having run in a very long time, it's not hard at all to get fat. I find "zone 2" cycling (measured in power, but equals ~60% of my max heart rate) to be far less stressful on my body than running/jogging, given trying to burn the same number of calories.