…it doesn’t seem right to consider the ~170 hours of volume on the CT as well-structured base training since it wasn’t well-structured or gradual/progressive in nature. Any thoughts?
That is a very wise assumption. It’s much more common for the average person to think, “I am so Superman right now.” Good job getting it done.
Your trip was likely a mix of “spending” and “saving” from your aerobic bank. Because of the huge volume, I’m not really sure how to quantify either side to determine where it’s left your “bank balance”.
I suspect that you’ll need more than two weeks to fully recover. That is a huge load. Even when you physically feel recovered, other systems (adrenal, etc) may need longer.
Once you’re fully recovered, figure out the previous year’s average weekly volume. Try a week of it and see how you feel. When starting a new training cycle, the first week should feel pretty light. (And you’re recovery weeks may be at half that amount.)