1. How long has Olivia wanted to be an architect? Oh, Olivia's wanted to be an architect since she visited Barcelona.
2. How long have your parents been married? I don't really know, but they've been married for a long time.
3. How long has Alice known Samuel? She's known Samuel since they started school together.
4. How long has your sister had long hair? She's got long hair for at least six months.
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