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The phrase "how long have" is correct in written English and can be used in informal conversation as well.
For example: How long have you been waiting for the bus?.
Exact(60)
How long have you been painting?
How long have you been together now?
How long have you watched this location?
How long have you been involved?
How long have you been lost?
How long have you worked here?
For how long have you owned it?
Owner: How long have you been here?
How long have they been watching?
How long have you been doing this?
How long have you been here?
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com