Can you solve the Riddler’s Riddle?

I am unpredictable, yet you always rely on me.

My installments give you the experience of life free of charge.

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What am I?

Riddler's Riddle

The answer: Time.

Did you enjoy Riddler’s Riddle? Try your hand at another. Riddler’s Riddle: I Am Always Around

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This riddle originally appeared on Reddit.