Once the motor stops, or 40 minutes has elapsed, stop and remove the motor. You can cover the entire unit with heavy blankets or insulation to allow the ice-cream to "ripen". Serve immediately, remove ice-cream from the tank and put into large plastic containers with lids and then place in a freezer to "ripen". At least one hour, up to two hours. This term is used to describe how the taste gets better as the ice-cream sits for a period of time.