How long does it take for certain stages in a relationship?

How many months/years for each stage? Just curious. Let’s assume it’s a long term relationship what would you expect for these (not in specific order) and how long did it take you if you have?

1) saying I love you for the first time
2) introducing them to family
3) moving in together
4) getting really comfortable with them. Eg asking them to buy something from the grocery store that’s personal such as feminine products or something similar
5) proposing
How long does it take for certain stages in a relationship?
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