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I figured it out - my printer (Monoprice Ultimate) has really slow acceleration defaults (800). When I fix the Cura profile to have them (instead of the 3000 is inherited from the Wanhao Duplicator 6 config) the estimate it gives is 7:22 (which is accurate - it took just over 7 hours).

So, now I just need to do some testing and see how much I can increase the acceleration without ruining the quality and I should be good :-)