The length of one shirtday varies between 7 and 10 full days. A person (usually a gamer) wears one t-shirt for this amount of days. In order for a time period to classify as a Shirtday, one shirt must be worn at all times; includes sleeping. The shirt may be taken off during bath time, but only once during this period. This, however, doesn't usually happen and is a rare occurance.
by ZickZak October 29, 2020