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Hi and welcome to BYC. There are no stupid questions - everyone has to start somewhere.
However, the question you asked will get a dozen different responses and you will have to make your own decision based on your own surroundings.
I, for one, do total free range - meaning no fences. I let them out of the coop in the morning and they take off into yards and woods and hopefully come back in the evening. A sad downside to total free range is predator loss and I have lost a few over the last two years. I do have 4 dogs who help with predator patrol and intermingle with the chickens all day long and sleep out there at night. I am surrounded by tens of thousands of acres of woods and have no neighbors.
That being said, I start letting them out of the brooder hutch (in the coop) at about a week old as long as it's 60 or so degrees outside. I keep the run gate closed so they can come out of the brooder hutch (where a heat lamp is only used at nights) and run around the coop and venture outside into the picket fenced run area. By three weeks old, they are being allowed to total free range along with everyone else. By about 7-8 weeks old, it's hard to tell them from the grown birds. They are large and fully feathered and run about the place, returning at night.
In any event, since yours are at 20 weeks they are at laying age and hopefully have had access to outside the coop. You should have a fenced run area that they have access to.
I would advise anyone to have a coop, put the brooder in the coop, start letting them out of the brooder to run around the coop as early as possible, and to have access to a fenced outside run.
All of my chickens live peacefully together, all ages, sizes and breeds and 14 roosters to boot. No fighting, no feather picking, no egg bound issues. I believe it's because they get to wear themselves out being chickens running around all day long.
Right now I have a mama hen and her babies running around and she took them out of the coop when they were just a few days old and it's in the 60s here (they have never had a heat lamp). I figure if it's good enough for mama hens, it's good enough for the rest of them that I'm raising.
I love being able to walk around my farm and have chickens following me or to come upon a roo and his little flock of hens wherever I go. I also like finding hidden nests of eggs. Since I never know how old the eggs are, I put them in the bator and so far they always hatch so I've constantly got little chicks running around.
One final big advantage to free ranging is that they lay sooner. Mine start laying at barely 4 months old - 16 weeks. And it's not just me, I've read articles that back up this claim.
So, all that being said.....if at all possible, let them out for a little fun and you'll enjoy them so much more.