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Yes, you assumed correctly.

I see after a further search there are rust removing machines outputting at that wavelength

From what I have read these rust removing lasers are Co2. They range in output from 20W-2000W operating as pulsed and/or continuous modes. Wavelength is 10,600nm.

Some impressive things.

Something I read long ago. To get a small spot, spread the beam, then focus the beam.

https://slickscreen.github.io/laser-tools/brightness/

Your question is impossible to answer, except to say somewhere between X time - X time.

I've some fluorite that fluoresces a weak orange

That glow was just scattered laser light.

I've a class 3b 405nm laser. I have found many things that fluorese under that wavelength. Even found some rocks that are phosphorescent or thermoluminesent. They glow orange. Even old white paint glows a pale bluish white. Old cement same color as the paint.

An Axicon lens will do what you want.

https://www.edmundoptics.com/knowledge-center/webinars/laser-beam-shaping/?utm_medium=email&utm_source=webinar&utm_campaign=importance_and_fundamentals_laser_beam_shaping&utm_content=eob_invite_drop1&utm_term=laser_applications&mkt_tok=OTUxLVdYVy04NDQAAAGFc9E0A3hJtZHGq9_C53We7pNK9FJwbon-HfYK7LVRz...

Your post is suspect. In other words I doubt you are in law enforcement.

Light in a vacuum travels at C. Light passing through a transparent material travels less than C. This is how you slow the speed of light. Video it at 10 trillion FPS.

What are the beam specs?

Your assumption is correct.

The city Shanghai is in a Covid lock down. The very same city where Sanwu Lasers is located.

https://www.edmundoptics.com/knowledge-center/webinars/challenges-of-coating-laser-crystals/?utm_medium=cpc&utm_source=webinar&utm_campaign=coating_laser_crystals_webinar&utm_content=google_retargeting_eob_traffic_standard&utm_term=laser_applications&gclid=CjwKCAjwo8-SBhAlEiwAopc9WyI7SIYt5-_UDl6q...

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