I was renting cars on a monthly basis in 2020 and 2021 from Enterprise. I logged into Enterprise with my "Emerald Club" for the 5% discount or whatever it is. I just logged into my Emerald Club account on National for the first time, and realized under Rewards that I have 12 "Free Days" mostly broken down into 1 day and 2 days.

First question.. can I combine all these separate "free days" into simply one 12 day rental?

Second question.. can these "free days" be used overseas? I'm not sure what countries would be available? I plan to travel overseas again in the near future. The free days expire end of 2022.. so I wouldn't want to miss using it. Does National have any places to use the free days in Asia?

Third question.. I just did a quick search to redeem free days in my city (Portland).. and it shows "no results" even though there is apparently a National rent a car at the airport. I'm confused why I'm seeing no result.. and what kind of blackout or other restrictions there are that might be causing it? I just searched for 3 weekdays in February just to test.

Basically, I want to learn and understand the best way to use / redeem the 12 free days before they expire this year.. and picturing to either use it for a 12 day trip locally or somewhere nearby or possibly overseas.