Well since you are retired why race around & try yo do it in only 2 months?
From MD we have done the loop around doing the Pacific Northwest twice. Each trip was at least 10,000 trailer miles. Each trip was over 120 days. Both trips seemed a bit rushed. Neither one was what you could call laid back & easy going.
If starting from CA head out in April/May towards the Gulf Coast, up the Atlantic seaboard & back across either through the middle or north to Seattle then back down. Figure on at least 4 months to do it.