'how visible' is correct and usable in written English.
You can use it when describing the level of visibility of something, such as in this example sentence: "I marveled at how visible the stars were on an icy winter night."
These are: the volume of visitors – how many people visit your site; the value of visitors – what do they spend; and visibility – how visible is your brand for search engines, social media networks and other sources of traffic?
How visible were they on retail sites?
But that perception underscores how visible gay people have become.
How visible will you be in the re-telling?
So how "visible" is the learning you want pupils to achieve in a lesson?
But there is some question about how visible these images will be in the future.
How visible is a PGA scoreboard without Tiger in the top 10?
How human this brief passage makes Pechvarry, how conflicted, and how visible it makes his scars.
Further study is also required to determine exactly how visible faults or crack discontinuities emerge.
I.E. how visible it was from our planet, how luminescent it was.
But don't stop there: look out for where the sign was placed (how visible was it?), if there were other signs, what the sign said, and so on.
