Q&A

 Master

This would normally take about an hour, but there are many variables when trying to diagnose a problem like this, there's often no clear cut path to an efficient diagnosis. There can be many different symptoms for a problem with an ignition coil, so a lot really depends on what the symptoms were, how often the problem was occurring, if there is a history of part/system failure and the mechanic performing the work.

 Journeyman

does your car stall or misfire? if it stalls, try cleaning the throttle body. if its a 6 cyl it may be the idle control valve. if its a 4 cyl misfire (usually cyl 2 but may be 3) the ignition module may be defective. more info is needed. your issue is not clear. i REALLY doubt you need a coil on this model car!!!