4,267 Hours

I knew

the trap would fail.

Leg pinned,
probably broken,

for hours

before i shuddered,

found you;

barely breathing, you'd dragged the trap.

Not dead.

I killed another mouse when I was seven with

a rock.

Now, twenty years later, 

again.

Assuming an average worldwide human life expectancy of 67.2 years (source) and an average mouse life expectancy of about 2 years (source), one human hour could be considered about 33.6 mouse hours.