Correct. All Star buildings are only 3 stories, with 64 rooms per floor (192 rooms per building). POP buildings are 4 stories with 72 rooms per floor (288 rooms per building). Different counts for All Star Music which has several family suites, which are essentially 2 connecting rooms. Those may take slightly longer or shorter, depending on what gets done for the suites.
A rough estimate looks as though each POP building took ~70 days to complete (some longer, some shorter). I don't know if anyone has actually kept track of the length to complete each building so far. With one less floor and fewer rooms, AS buildings should be less than 2 months each. Of course, that's assuming just the planned renovations and no other work needs to be done (I think a couple of the POP buildings had extensive plumbing work that added to the job). POP renovations took a total of slightly less than 18 months. In general, each All Star resort should have a shorter renovation time start-to-finish compared to POP.
Enjoy your vacation!