head bolt torque

ok....question....i understand torqueing in 3 stages to get even and uniform clamping...however....
when you do that according to the torque order. when you get the last one torqued, the first one has a bit to go to get back to that torque value again....

so do you torque in the proper order up to the torque spec and leave it, or should i torque them to spec twice?

also....they need to be retorqued after x-long because of new bolts, correct?