I'm sorry. Once a week.
The mailboxes are placed strategically so that they look nice. They are on a small path near a wooded area with a nice slope. Come winter, and the first ice, it may take one, two or three days before people can get to the mailbox. Some days, they can't open the box because of the ice, but it isn't a huge deal. They say that they'll come back the next day, that there will be a slight thaw and they'll manage to get it open.
The criticism I often hear is that snow removal around the boxes isn't always done properly. Near my home, near a school, people park near the community mailbox. When the snow plow goes by, the driver obviously doesn't get out of the vehicle with a shovel to clean around it. He moves on to the next place. That means that we are stuck for a week or two with a pile of ice on top of the snow that was already on the ground. Obviously, this irritates people.