According to Exodus 21:2, how long may you own a Hebrew slave?

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Six years

(Unless he refuses to leave his family, in which case you bore a hole through his ear and he is your slave forever.)

If thou buy an Hebrew servant, six years he shall serve: and in the seventh he shall go out free for nothing.

If he came in by himself, he shall go out by himself: if he were married, then his wife shall go out with him.

If his master have given him a wife, and she have born him sons or daughters; the wife and her children shall be her master's, and he shall go out by himself.

And if the servant shall plainly say, I love my master, my wife, and my children; I will not go out free:

Then his master shall bring him unto the judges; he shall also bring him to the door, or unto the door post; and his master shall bore his ear through with an aul; and he shall serve him for ever. Exodus 21:2-6