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In page Speed of light:

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One way to characterize the transition to relativistic effects is the Lorentz factor. This is the factor γ by which lengths contract and times dilate and is given byγ=11−v2c2where v is the speed of the object. The difference of γ from 1 is negligible for speeds much slower than c, such as most everyday speeds – in which case special relativity is closely approximated by Galilean relativity – but it increases at relativistic speeds and diverges to infinity as v approaches c. For example, a time dilation factor of γ = 2 occurs at a relative velocity of approximately 86.6% of the speed of light (v ≈ 0.866c). Similarly, a time dilation factor of γ = 10 occurs at approximately 99.5% the speed of light (v ≈ 0.995c).[citation needed]