I wouldn't consider anything less than 20 feet a "safe" distance, and even that depends on circumstances and a little luck. For plants that are small enough I have used translucent plastic storage tubs as temporary terrarium quarantine units. It is far from absolute, but it does add some physical barrier to the distance aspect of isolation.
As for how long, at least 6 weeks with weekly close inspection. You do have to examine roots too for mealy bugs, snails and some others, so you might as well plan on repotting shortly after you get the plants. Changing the media also gets rid of some potential pest problems. And take precautions that you don't transfer pests as you go from plant to plant.
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