Tours are a concept that would be completely foreign to either side. Total War, total struggle. Soviets could expect no leave; units were rarely if ever 'rotated out' - it made more strategic sense for the STAVKA to simply raise new units in strategic reserve. In short, if you were a Soviet soldier, the Front is what you knew, bar amalgamation into a new unit or being 'pinched' out of battle (that is, successive waves pass through your unit, or the front shortens to a point where your unit is no longer on it).

Germans could expect leave, perhaps one or two weeks out of the year, naturally accounting for travel time. Its laughable however to imagine the Heer shifting entire, fit-to-fight units off the line when they attacked with no strategic reserves to begin with.

As a German, you went 'Heims ins Reich' for only three reasons: Maiming or wounding, the amalgamation of a tired, destroyed unit into another, or you were selected to form a cadre for a newly-raised unit back home. Even then, and even as a convalescent, there was a serious chance you would fight again, especially as the situation became more and more desperate for the German Heer from 1943 onwards. Most leave as well would rarely take you all the way home; Kharkov before the crushing winter counterattacks was a rest area, Italy was another common destination for leave.