Hi :)
I'd say somewhere between 100-300, depending on the type of work, size, distance etc. I've not done a lot of this type of work, so someone else will probably have a better idea. Though I can suggest printing a couple of samples off at different resolutions and simply seeing how they look from your proposed distance. Also, ask the people producing the vinyl - they will have had a lot of experience in this area!
Cheers
/Doug
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