MDG: Rav Ovadia holds 72 minutes b’shaot z’maniot, which can vary depending on the time of year and latitude. So according to him 60 minutes could have been 72.
I personally know from a family member of his that he holds sha’ot zmaniot, but only lechumra. In the summer time he usually keeps 85-90 minutes and even in the winter time for some reason he doesn’t do less than 80. I was gonna write this before, but I felt no need.