  We present recent results on b-hadron lifetimes and mixing obtained from the
analysis of the data collected at the Tevatron Collider by the CDF and D0
Collaborations in the period 2002 - 2004. Many lifetime measurements have been
updated since the Summer 2004 conferences, sometimes improving significantly
the accuracy. Likewise the measurement of the $B_d$ oscillation frequency has
been updated. New limits on the $B_s$ oscillation frequency have been
determined using for the first time Run II data.
