I have been reading a lot on a Dutch chicken forum several years ago. It seemed that people who bought new chickens to add to their flock often got into trouble, if the seller had chickens in crowded conditions and from sellers that sold out of boxI would try it for at least ten days to protect your existing flock if you can manage it.
If you stay clearly focused on protecting your existing flock then it will be easier to develop routines that prevent your current flock from going near them.
Also remember your shoes and outer clothes.
I quarantined the Math Majors when Barb gave them to me and it was a real pain so I definitely empathize!

Advice on this forum was to quarantine at least 3 weeks.*
Buying my first chicks from a hobbyist /commercial seller, I had too many chicks who dropped dead after week or two.
For me this experience and reading what other hobbyists had experienced, it was an important reason for me not to buy new chicks/pullets after I had a healthy flock of 4 Dutch. I let my broodies hatch eggs if I wanted more chickens.
The only exception was Kraai, who came as a loner from people that were moving to a house with a tiny garden.
*PS if you don’t want to take much risks with newcomers.
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