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It is a well known fact that the usual complex structure on the real CliffordAlgebra (CA) of Minkowski spacetime can be obtained by adding an extratime-like dimension, instead of the usual complexification of the algebra. Inthis article we explore the consequences of this approach and reinterpret knownresults in this new context.  We observe that Dirac particles and antiparticles at rest can be interpretedas eigenstates of the generator of rotations in the plane formed by the twotime-like coordinates and find an effective finite scale for the extradimension when no EM fields are present (without postulating compactness). Inthe case of non-vanishing EM fields, we find a gauge condition to preserve sucha scale.

Particle-antiparticle duality from an extra time-like dimension