I quarantine for a full 12 months in a separate room, with no equipment exchanged. I believe anything less is a ridiculous risk.
Some of the more deadly viruses can incubate for up to 10 months--and that's information from a vet. I will not risk my collection by cutting the quarantine period short. Safe is safe--everything contagious (that I am aware of) will show up within 1 year.
The same cannot be said of 1 month, 3 months, or even 6 months.
How much of a risk you want to take is up to you, but don't be naive about the level of risk you are taking. Every year there are people who report losing their entire collections to viruses.
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