How long have you had your current hairstyle?
I've had this hairstyle since X / for X months/years.
What is the question to the answer: "I've worked here for six years."?
How long have you worked here?
How long / parents / be married? + ANSWER
How long have my parents been married/divorced? / They've been married/divorced for X years / since X.
What is the question to the answer: "We've never been to France."?
Have you ever been to France / Paris?
Has your pet ever run away?
Yes, it has. / No, never.
How long / you / know / your best friend?
How long have you known your best friend?
ever / you / eat / sushi? + ANSWER
Have you ever eaten sushi?
Have you ever shopped online? If so, what?
Yes, I have. I bought a pair of sneakers. / No, I haven't. / No, never.
How long / I / have / my backpack? + ANSWER
How long have I had my backpack? I've had it for x months/years / since (month/year).
How long haven't you seen your grandparents?
I haven't seen them for X days/weeks / since X.
How long / I / be awake / today? + ANSWER
How long have I been awake today? I've been awake for X hours / since X.
How long / you / study / here?
How long have you studied here?
How long has your best friend had his/her cell phone?
She / He has had it for about X months/years / since X.
How long have you lived in your house/apartment?
I've lived there X months/years / since X.
How long have you studied English?
I've studied English for X years / since I was X years old.
How long / have / pet? + ANSWER
How long have you had your pet? I've had it for X months/years / since X.