The study investigates whether everyday stress caused by intellectually demanding tasks that need to be done simultaneously affects people's perception of time and thus also their time preferences, given that individuals' preferences about time are based on their own perception of time. The study tests the link between stress and time perception and the link between stress and time preferences experimentally in a computer laboratory by exposing the participants in the experiment to different degrees of stress in the form of tasks of varying difficulty that jump up while time perception and time preferences are estimated. The study differs from other studies investigating the link between stress and time preferences in that we study time perception as a medium while others have justified the link with the negative effect of stress on working memory and thus the ability to think logically about intertemporal decisions. While we expect everyday stress to increase patience by making time seem to pass more quickly, the opposite is true according to the theory that stress affects time preferences through a negative impact on working memory. We will also examine whether there is a level of stress that is high enough that the negative effects of poor working memory on patience dominate the positive effects of perceiving time as faster. The study could potentially explain the mixed results shown by previous studies on the subject.