So the roof is up to 6 courses, with 5 having a second ply mortared on.
The corners continued to be a bitch until I realized I need to slope them in faster than the roof walls, because they need to get to the center faster as they have farther to travel. Hence the nearby tiles are sloped in as I approach each corner. Now that that’s understood, I think I can make faster headway and get a row done and 2plyed in 2.5 hours. So maybe 3 courses a day 2-plyed completed?