If I'm not mistaken its roughly 1-2 mins upon turning in the marching orders for him to reach the first marker where he spawns the war mobs (including the chief) around the fort.
Then it's 4 mins ish for him to spam some chat stuff, fall in and out his army, then make it back to outside the fort close to the start of the slope when he says "Charge". At that point you have roughly 30 seconds before he reaches the fort and engages the giants (subsequently killed). So in total close to 6-8 mins upon turning in. I always recalled it being a cutting close situation since you need to be quick and properly planned to avoid him dying if you are too late.
You can also get someone to kite garadain around if you are going to be late turning in the head so that he doesn't get killed. I've done this a few times for some folks to avoid them losing out, so to speak
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