If you want to complete Trace without any tutorials, it will likely take you at least a couple of hours. It really depends on how good your puzzle-solving skills are, but even the most seasoned escape game veterans will probably need at least an hour. Luckily, you can save your progress and come back at another time to pick up where you left off. It is almost impossible to beat Trace in one sitting, although you are welcome to try if you want!