Harlan is a man, so I’d tend to say he cries closer to 15 gallons a year. But he’s also a yewt, so I’d tend to say he cries closer to 30 gallons a year.

Factoring in everything, I’ll assume he cries about 25 gallons a year.

I’ve never seen Harlan in person, but he seems like a pretty small guy. I’m guessing he could easily lay down in a 100-gallon tank while crying.

If he were to continuously cry (which he is), he would fill the tank in four years. Thus, Harlan is projected to officially drown in his tears on the evening of November 9, 2028.