In my first playtrough i finished Inquisition in about 31 hours flat on normal. I cleaned Hinterlands, Crestwood, Storm Coast and Hissing Weasts, finished cold and spirit rooms in temple, freed Inquisition soldiers from Avvar, cleaned Wester Aproach and Exalted plains to the point of needing operations to build bridges.
That didn't happened with Origins, although i had Stone Prisoner DLC.
Everyone's experiences are going to be at least a little different. You'll forgive me if I take mine over yours with regard to my personal reckoning of the comparitive lengths of the games as per how I treat such matters.
Much of Origins' main quest length is slogs through locations such as the Deep Roads. Inquisition's so full to bursting with side slogs as to make the Deep Roads blush, so its critpath missions are straighter to the point and more loaded with narrative. In terms of actual critpath-centric scenes and story beats -- those being the only terms I ever bother identifying in gaming, mind you, because I'm not much of an actual "gamer" otherwise -- they're close. Stuff like the interlude Loghain and Anora sequences in Origins are one-minute affairs and the confrontations at the ends of each of the midgame quests are generally no longer than ten minutes themselves.
Game's got nothing on certain older-school JRPGs and a few big older WRPGs in raw main arc script. And it doesn't really have much on Inquisition, either.
Rushing the two games? Absolutely, Origins is longer. The Deep Roads, the Fade, it's all there, mandatory.