RD moves pretty slowly. IIRC I've seen accounts that have been inactive for 5 years and their RD is not at 350.
Also, AFAIK, the mathematic details of Glicko are online for free. If you look into the math you could figure it out.
What is chess.com rating period
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I'm learning about the glicko rating system which chess.com uses. After a period of inactivity, the RD associated with a rating increases. The amount of increase is related to what chess.com defines as the length of a rating period which is related to 'c'.
Does anyone know the amount of time chess.com defines as the length of a rating period, what 'c' is numerically defined as, or how much time chess.com uses to predict when the RD would go back up to 350?
Those familiar with the glicko system should know the references.