Depending on what you mean by a suburban-sized lot... here's my blog post on complete nutrition from plants, eggs, and fish (all of which can be grown/raised on a typical lot): https://automicrofarm.com/blog/2018/08/complete-nutrition-no...

Can you put lot size into square-feet or fractions of acres? How much arable land exactly (considering buildings and other things take up land space)?

I'm currently looking at places where growing some of my own food might be possible and I'm curious what is possible.

Yes, will do when I get the needed spacing blog post up!

And how much space do you need to grow all of that for 2 people for 365 days in a year considering that only some of it can grow year round in many places.

To grow year-round, you would need to have a greenhouse in a lot of climates.

(I'm working on a blog post to answer the space needed question.)

I don't think the average person should expect or try to. But there are people who produce tonnages of produce on a 1/10th acre (granted, these are in California and Florida with year-round growing). The person in my parent post talks about how he was able to grow 300 lbs of sweet potatoes on 200 sqft of yard with very little effort and input. I think the most important thing is for people to realize how much, 30%, 50%, 80% of their diet they could hypothetically produce. It is also great motivation to transition one's diet away from processed food to vegetables.

I don't believe any of these ideas should be an all-or-nothing venture but if individuals can take back just 10% -20% of their diet from unethical agri-business, it's a MASSIVE win for health, self-reliance, environmental awareness, and community building