A "touch and go" involves landing on a Runway and taking off again without coming to a full stop. Several "touch and gos" can be done in a short time. TouchAndGos are usually done to practice landings.
The rules giving how long the Aircraft can stay on the Runway and still be counted as a touch and go are airport specific. A number of "touch and gos" can be considered only one arrival/departure. The rules regulating this are airport specific. | 