Sometimes it feels like weeks or months can go by in a blink. Do you have any tips to feel like time passes slower?

Intense exercise, particularly cardio. Search for a good interval workout and push yourself to a barely-sustainable threshold pace. You'll find yourself saying, "When is this going to end!? I can't wait for this to be over!" Also do this in the mornings so you feel like you have the entire rest of the day to enjoy.