Hey, why was I taken out in the first place??!?!?!?
I forgot to subscribe to my own topic..... I would do the sniff test, because of the vinegar it keeps pretty well in a cold fridge. I would keep it in the back, not the door, if you don't use it too quickly.
Do a single recipe at a time. It is more likely to "break" and be liquid if you do too much at one time.
Speed? Hmmm....not too low, not too high! Just above low, starting to get into medium, if your machine is powerful. You will have to experiment. It should become something that looks like mayo within seconds, and stay that way as you are adding the oil slowly. I often will stir the last bit of oil into the mayo and hit the on button for another 2 seconds.
I do like the idea of experimenting with different oils. I will have to save the bacon grease next time we splurge on bacon and try that, ooooh, yummy on sandwiches, I bet. I may have to try a batch with chicken fat. Wouldn't keep as well, I suspect, but we eat a lot of mayo when we are making my cabbage-free coleslaw.