How long does a front end alignment take .also .. on 2004 BMW 325i

Will it make dsc n brake light indicator go off been told it could be a cause
If not how much does the dealership charge to run on machine ?

Asked by for the 2004 BMW 325i
approx 1 hr depending on if any parts are needed
I was literally just told it would take 3 hours to do an alignment that's gotta b a joke n rediuclous for how much its costing .