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The phrase "how long has" is grammatically correct and can be used in written English.
It is typically used at the beginning of a question to inquire about the length of time something has been happening or a situation has been in place. Example: "How long has the company been in operation?".
Exact(53)
How long has it been?
How long has this been a problem?
How long has yours been around?
How long has Cigar Aficionado existed?
"How long has this sport been around?
How long has it been gestating?
Similar(7)
How long had it taken?
How long had they waited?
How long have you been painting?
How long have you been together now?
How long have you watched this location?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com