We consider a fully relativistic method for the calculation of tunnelling times based on the streamlines of the conserved probability flux. This method is similar to that proposed by Leavens but is not based on the Bohmian interpretation. The method is applied to single and two-particle tunnelling in Dirac theory.

A. D. Challinor, A. N. Lasenby, S. S. Somaroo, C. J. L. Doran and S. F. Gull, **Tunnelling times of electrons, ***Phys. Lett. A*, **227**, 143-152 (1997)