Insurance policies are typically only written for 6 months or 1 year. So instead of finding a 2 month policy you instead will likely need to renew for 6 months and then cancel your policy once you no longer need it.

If you own a car here in the US and want to continue to have it registered then most states will require you to continue auto insurance on the vehicle. If you will be putting the car in storage or placing it somewhere else where it will not be required to have registration on it then you can turn in your license plates and take off insurance in most states.

Since state laws differ, if you are leaving a car behind when you leave the United States check with the Department of Motor Vehicles of the state where the car is registered to see what they require of you as the car owner in regards to auto insurance.