  We theoretically investigate the experimental observable of the ballistic
collective group delay (CGD) of all the particles on the Fermi surface in
graphene. First, we reveal that, lateral Goos-H\"{a}nchen (GH) shifts along
barrier interfaces contribute an inherent component in the individual group
delay (IGD). Then, by linking the complete IGD to spin precession through a
dwell time, we suggest that, the CGD and its GH component can be
electrostatically measured by a conductance difference in a spin-precession
experiment under weak magnetic fields. Such an approach is feasible for almost
arbitrary Fermi energy. We also indicate that, it is a generally nonzero
self-interference delay that relates the IGD and dwell time in graphene.
