That's certainly more than 5 weeks fungus growth. I have lost 1 lens to fungus. It could have been repaired but the repair cost exceeded the value it would add to the lens so I sold it with the fungus declared in the listing.
I also had all my Agfa cine film damage by fungus. None of the old Kodacrome was affected.
I now store my lenses that I don't use regularly in a clear plastic box with a rubber airtight seal and have a silica-gel brick inside the box. Gives peace of mind and the setup cost less than $20.