Saving a few seconds each t-shirt doesn’t sound like much but multiply that over your lifetime and you may just find yourself with hours of extra time, ideal if you want to sit for longer in front of the TV watching reruns of Impractical Jokers for instance!
The pinch and fold
The pinch and fold technique is rather good but takes a bit of practice + you need a flat surface.
The scientific version
Engineers at University of California Berkeley state this is the best method for a rectangle t-shirt fold