The best thing about watching this series.
Every episode different story so watch any episode in any season in a any order according to you mood. you mood.
This series have the best stories and animation you have every seen.
Episode are only 8 to 14 minute i think so it wont be any trouble finding time.
Every episode is so different as to the animation every episode is a new experience
26 Episodes which if you bench watch will be over in couple of hours, but don't do that watch 2 or three a day or you get sad when you finish it but i think S3 is right around the corner.
Advice open any episode feel the animation if it suites your mood watch it or skip to the other one and watch the skipped on in the right mood.
some screen shot from few episodes randomly...
this one has a fee to it like the spider man into the verse 
she is not real and he is not real 
this is a nice one 
have wondered about yogurt becoming president well this once for you
that is animation not real people this once also an extraordinary episode 
look at that animation different from the previous one every episode is unique and awesome , Zima blue is one of my favorite i re watched it to day but only took 8 minute or so... if you haven't watched it lucky you give it a try you wont regret :)
@EuphoraLove