Load this simulation http://www.compadre.org/Physlets/mechanics/prob5_12.cfm
Pull the mass away from equilibrium and let it go so that it is oscillating at the end of a spring. Start it from rest at a position 8 cm from where it started (x reads "8 cm") What are the period, amplitude, and frequency of the oscillation? What is the spring constant? If you click on the "fast-forward" button it will move 1 second forward with each click, so that should give you a time scale.
If you are having difficulty using the simulation, you may use the following
screenshots to get your answer. Each image is one click or one second apart from
the previous image.
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