How to keep partial fit from continuously adding to a model - MTLK

[ehowardl3]

I have a saved search that runs every day and does a partial fit over the previous day. I'm doing this because I need 50 days' of data for the cardinality to be high enough to ensure accuracy. However, I don't want over 60 days' of data. How do I build up to 50 days' of data in the model but then roll off anything over 60 days?

Thanks!