It looks like it's 20 years if you aren't a citizen. If you become a citizen or are born in Argentina then it's 10 years.I just looked at the info on this page (which I first read almost two years ago) and it looks like 20 years of LPR is "still" a prerequisite for PAUM and PAMI
Has something changed that has made the 20 year LPR requirement obsolete...and the website has yet to be updated?