DaveC426913 said:
How long does that last step take?
In an ice cream maker, somewhere between 20 minutes to half an hour (very roughly), depending on how much you make. I have a gallon can, but 3/4 of a gallon is the most I can make if I really want a good consistency to my ice cream. I only make 3/4 of a gallon if it's a large group. Half a gallon would normally be the most you want to make.
The more salt you add, the lower the melting temperature of the ice and the faster the ice cream freezes. Too low of a temperature, though, and you start to get ice chunks in your ice cream - crystallized ice chunks of the mixture, not water. You want a nice creamy texture which means the entire mixture has too cool at about the same rate, hence cranking the beater blade through the mixture. You can shorten the time it takes to freeze by adding more salt, but you better crank faster, too. You don't want the mixture at the outside of the can to be much colder than the mixture in the center of the can.
If it doesn't get really hard to crank no matter how long you crank, it's because you didn't add enough salt. You need to add some more. Provided you didn't waste all of your ice using too high of a temperature, starting out with too little salt doesn't hurt the ice cream - it just makes it take a lot longer. Running out of ice because you didn't add enough salt means the ice cream is still too soft to put in the freezer. The ice cream will settle and you'll get some ice chunks.
I can understand Moonbear's comments about all homemade ice cream not being very good, because there's a lot of ways you can mess up the texture, especially when you first try getting the feel of just how much salt you need.
I mean, let's face it, some people can't even handle toasting a marshmallow. They get impatient and char the outside while leaving the inside raw.