Object	Speed	v/c (%)	Time Dilation
Automobile	0.03 km/s = 100 km/h	0.000001	1
Aeroplane	0.5 km/s = 1800 km/h	0.00016	1.000000000001
Space Probe	40 km/s = 144,000 km/h	0.013	1.00000001
Ions at Heidelberger Testring	19,000 km/s = 68 million km/h	6.5	1.002
Myons in Accelerators	300,000 km/s	99.94	30

The stretching of time depends on the velocity.

The higher the velocity in comparison with the velocity of light the larger the effect.