Typically services are 15 minutes. That includes military honors They have services every 1/2 hour. I am a chaplain there and it is pasted right on the podium.
It depends on the type of service you want.
I've only attended 1 service there but I imagine they would all be similar. There's probably some family choices that can affect timing as well. For me it was probably 1/2 hour in the chapel and another 1/2 hour ceremony with taps and flag presentation. Add another hour or so for waiting and getting around.
It depends on you
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