Since there are 4 three month periods in a year and there are 6 years - The squirrels will multiply 24 times then there will be
Month 0:10 Month 3:20 Month 6:40 Month 9:80 and so on until you reach 8,388,608 Which I think is unlikely.
I'm not certain on my math or if I did this right, but it's my best guess