We use a hand mixer (with two paddles). Start with a yolk (or two if more mayo is needed), a teaspoon of mustard, some lemon juice. When these are mixed add very little oil, splash by splash . When the oil is incorporated add more, increase the rate as you see the mayo taking shape. But don't poor freeely. Half littler of oil would take less than 5min.
If the oil separates you need to start from the beginning, then slowly add the failed mixture when you have some mayo formed.
This will give you a fluffy airy lighter mayo. For a fast denser mayo use an immersion blender. All ingredients in, move the blender up slowly.