Freeze the internal cylinder of your ice cream maker for several days, or if you are using an ice cream maker with a compressor, you might want to halve the recipe.
Remove flesh from avocados and place them into food processor or Vitamix.
Add milk, cream sugar, lime juice and salt and process until smooth. Taste and if more sugar is desired, add a little at a time.
Pour into ice cream maker and turn on, per manufactures instructions, around 25 minutes. When ice cream machine stops, or ice cream machine starts to strain, turn off machine and scoop ice cream into a container.
Place container of ice cream in freezer overnight, or until desired firmness.