If you've got time to buy animal products, you've got time to buy fruits, vegetables, nuts, beans, lentils, seeds, and grains. Being vegan is no more time-consuming than being a non-vegan, so this is a completely redundant excuse. Indeed, often the foods that take longest to cook are animal products. Put it this way: it ain't the nut roast that's in the oven for 8 hours on Christmas Day.
Add to that routine visits to hospitals and pharmacies that are part and parcel for many people who eat animal products due to their aggravation of our most common diseases, and you'll find that eating animal products turns out to be one of the most time-consuming endeavours you can undertake.
How about the people who don't have vegan products where they live? Sure, they can always get the basics (fruits and vegetables) but other than that the stores near me don't really have anything, other than almond milk, that I've seen.
I'm open to trying plant-based food, I really am (even though I'm a very picky eater), but there's not an awful lot of options where I live.