Time dilation is one of the experiences that's always fascinated me. I suspect just about every person has experienced time dilation. Time dilation is the experience of time either slowing down or speeding up. For example, if you've done a magical ritual before and you've felt like hours passed when perhaps only a half hour passed, you've experienced time dilation. Or if you've raced for a bus and felt like time sped up around you, you've also experienced time dilation.
When I do space/time magic, I like to warm up, as it were, using time dilation techniques. they are techniques that help to push the mind out of the linear frame of thinking it is used to, while prepping it for opening the doors of consciousness to explore time from a non-linear perspective. One of my favorite exercises to use comes from Jean Houston's Book The Possible Human (affiliate link). In this exercise you visualize time as a yard stick with past, present, and future occupying 12 inches each. Then what you do is take the past and give it 12 more inches, while having six inches off the present and future, and focus on experiencing a perception of time where most of the perception is on the past.
You can do the same exercise with the future, giving it 24 inches, and giving the past and present 6 inches each, or apply it to the present. Now you'll note that this is still a fairly linear perception of time, but the point of the exercise is to loosen up your habitual perception of units of time.
Time dilation is the first step toward experiencing and accepting that time isn't a constant and that we have influence on it. The usefulness of doing a time dilation exercise, whether in daily work, or just before you do a space/time working is that it'll push you outside the digital measurements of time we've come to rely on so much. And learning to activate time dilation at will can actually help out in those everyday situations, as well, because it teaches you to rely less on external measurements of time and more on internal awareness. You can apply that internal awareness toward shaping time around you, like in the time sphere working I discuss in Space/Time Magic.
Time dilation frees us of the automation of time, challenges us to question the measurements and schedules of others and shows us a glimpse of what time could be, if we are open to altering our perceptions of it.