It is huge, we didn't have long enough for it all. If I went again, I would do the Merchant Mall a different day, as it very exhausting.
Watch out for people who have rented electric scooters and are stearing through crowds for their first time, ouch!
At the CQA show in Vancouver I met people who had rented walkers, even though they didn't really "need" them so they could stop and rest often and had a place to put all their shopping bags.