Engine warmup
Engine warm up if shut down for less than two hours is 2 minutes at idle, if shutdown for more than two hours warmup is 5 minutes at idle.
Scenario: Engines have been shut down for 3 hours. Push back from gate, start both engines because it is required for initial taxi. After clear of congested area, shut down engine two (it has been running for less than 2 minutes) and continue taxi. What will be the warm up required upon restart of engine 2?