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X2 -- NOTHING good happens quickly in this hobby! :)As long as your tank is fully cycled, you can begin adding fish. But go slowly and don't try to add too many at once.
However, I'm afraid time-frame has nothing to do with the introduction of disease, be it ich or any other. Setting up a QT system will go great distances in helping with that. Take a look at the thread below for further explanation.
This is of course only my opinion and others will vary.
https://www.reef2reef.com/threads/how-to-quarantine.189815/