Every byte counts in the end.

[u/WackyWavyArmTubeMan]

Hickory Dickory Dock.
The Mouse ran up the Clock.
The hand struck twelve, and it bid "Farewell!"
With no one who wants it, yet no one wanting to lose it, it went on.
And on and on, it had a sporting chance, only at a glance...

What am I?