This shows the amplitude in cms (second column) at various times in seconds (first column) for an overdamped pendulum.
  Data from "Using videotapes to study damped harmonic motion and to measure terminal speeds" by M. Stautberg Greenwood, F. Fazio, M. Russotto, and A. Wilkosz, The American Journal of Physics, Vol. 54, 1986, 897-904, Figure 4.