A Touch and Go's does not exist as a stand alone maneuver. It is a normal landing followed by a normal takeoff. This means that like any takeoff the aircraft should be in the takeoff configuration (ie flaps set for takeoff and trim in the takeoff range) before full power is applied. If there is not sufficient time to reconfigure the aircraft in a calm and deliberate manner after it has touched down and control is assured before continuing with the "go" part of a touch and go then the field is too short.