Here's how I make mayonnaise in less than 2 minutes with an immersion blender.
This is the Cuisinart hand/immersion blender that I use: https://amzn.to/3LEAUmi
Link to my recipe: https://boundedbybuns.com/recipes/r/mayonnaise
Ingredients:
1 whole large egg
1 tablespoon Dijon mustard
1 tablespoon lemon juice (optional)
1 cup canola or vegetable oil
a pinch of salt