I don’t train for touring, as my 30 mile rt commute and weekend riding is enough to keep my fitness level up. However, in the winter there can be prolonged stretches where I don’t ride due to the weather and other obligations. I’ve probably never taken a full month off, but even a week or longer is a good opportunity to rest and recuperate. You will likely benefit if you’ve been training hard, letting your body fully recover. A couple easy days getting back into it will be enough. Pro cyclists require rest periods after a few hard weeks of racing on a grand tour, or they will lose fitness.