. Immigration is very friendly in BA. Soem of them speak very good English ( not Irish ). Staying in BA for 13 hours is very normal, but they will never ask you - they do not care as long as you do not stay more than 90 days . Tourist can stay up to 90 DAYS. Taxis are about $ 30-35 each way so take airprot bus or public bus #82 ( or it maybe #86 do not remember). There are two ATM outside immingration one is HSBC Withdrawal per transaction is low i.e about 300 Argentina Pesos - but you can just maek multiple withdrawals if you like.