When connected to a system with a resolution of 1280 * 1024 in True color at a screen ratio of 100%, the average data traffic is 0.8 Mbyte per-minute.
However, in the case of documents or e-mail, data traffic is smaller on average. In the case of a game or movie screen, etc. where there are continuous changes in the screen, there may be more data traffic than the average.
As a tip, reduce the screen color to 256 or aspect ratio to reduce the overall data traffic.