Examples:

• Q. I received my Star Code. How long is it valid?
• How long is it safe to use a nasal decongestant spray?
• How long is it to the highway, Ben?
• How long is it since you last time saw him.
• How long is it since you've gone out without that?
• How long is it since I brought you here?
• How long is it since they last played together?
• How long is it supposed to take before I feel the earth move?
• How long is it since you saw your brother?
• How long is it that you've known Mr. Beaumont?