If you wanted your work day to go by faster and could only cast on yourself, would you want to use Haste or Slow?
At first I thought Haste, obviously right? Wouldn't that just make me faster, and ultimately make it feel like time was moving slower?
If you used Slow, you would perceive time around you as moving much more quickly right?
Your perception of time would likely feel the same.
Haste would be more akin to being hyper and moving more quickly where as slow would be a sluggish lazy state.
Haste would lead to more work done, but ultimately there's a good chance time would feel "slower" because you'd get more work done in a shorter amount of time. If you're in a job where your only task is to get your work done and then you may leave, this would work but in a job where you are hard scheduled until a certain time it's more likely to force you to do more work than you already do.
Slow would lead to less work being done and more than likely a poor opinion of you by your superiors and possibly the people around you. Possible that you could feel as if time is moving faster because you're getting less work done in the same amount of time, but more likely to not it would feel worse because you'd be more likely to consistently look at the clock wondering what time it is as you slowly lag further and further behind in your work and depending on the potency of the slow effect maybe even lose your job to sluggish working speed.