They like to set the speed of light to be 1. That is dimensionless 1. It makes their calculations simpler this way instead of dragging some power of c everywhere like a loosely connected trailer on a dirt road.
When i took a particle physics class we measured everything in energy (eV). In this case of measuring everything in seconds, acceration would be measured in units of 1/s
I met a guy whose hobby was painting vulvas. It was a very active hobby and his apartment was covered with his work. He seemed very proud - his gf not so much lol