Much less now than in the past. I would say just a small amount of time since I am so busy lately. Usually the gazing isn't happening since the tanks are in places they fit, not specifically the places I would like them.
Easily when the tanks were in places I could see them when relaxing, was lots of minutes. Spending time watching how the fish interact, how they shoal, how they grab for food, making sure they are all there, counting or looking for the specific ones from the group.
Looking to move one small tank near my chair again. Easily the tanks win over the largest majority of TV and assorted streaming. <3