The time experienced by a phenomenon when passing through a tunneling barrier. In superluminal phenomena, the tunneling time is expected to be zero in some theories. But in others, it may have a nonzero value.
References
Steinberg, A. M.; Kwiat, P. G.; and Chiao, R. Y. "Measurement of the Single-Photon Tuneling Time." Phys. Rev. Lett. 71, 708-711, 1993.
