Regarding your inquiries:
If your initial flight is punctual, the connection is feasible but may be hurried. However, domestic flights are frequently delayed.
I would attempt to complete the check-in process before heading to the city. If this isn't an option, you can only locate a...
It is never enough! Lol
Buenos Aires provides such a wealth of experiences that I highly suggest extending your stay for as long as your schedule permits. Personally, my visits are never shorter than 16 days, and during my last trip earlier this year, I stayed from January 24 to March 8! Despite...