How do you recover your ability to log on if you lose the key?

Make sure you save the recovery codes when you set up 2FA / MFA.

Do the connectors retract? Looks as if they could be damaged carrying on a key ring in your pocket.

They do NOT retract, overall seems sturdy, I keep mine put up at home with a back up key in a safety deposit box at the bank. To make a copy after capturing the QR code with one key and saving the info, simply pull the key and stick the second one in and capture the same QR code, boom two copies, can do same with 2fa apps, the key is the same QR code, means same gateway sorta speak.

Does the yubi remained plugged into your device/pc the total length of time you are using device/pc, or do you unplug it once authenticated?

For OTP/U2F you only need it plugged in when you're prompted for the token (ie U2F on Github, Facebook, Google, etc.); It is a good security habit not to leave it plugged in. Yubikeys have many uses and while I don't know of any that require the Yubikey to be plugged in to maintain access you can use it as a "Smart Card" for logging into your computer (ie if the screen locks or you logout you will need it to log back in).

ASIN	B07WGJ1DNJ
Additional Features	Two-Factor Authentication, Dual Connectors, FIDO Certified
Best Sellers Rank	#46,949 in Computers & Accessories ( See Top 100 in Computers & Accessories ) #565 in Pen Drives
Box Contents	USB Cable
Brand	Yubico
Brand Name	Yubico
Colour	Black
Compatible Devices	Smartphone
Connectivity Technology	USB
Customer Reviews	4.4 out of 5 stars 2,092 Reviews
Flash Memory Type	USB memory stick
Global Trade Identification Number	05060408461969
Hardware Interface	USB
Importer Contact Information	Patelcraft Solutions Private Limited, Jaipur Office: Address: Devi Nagar, Jaipur – 302019, Email: [email protected], Phone: +91-7416733071 \| Bangalore Office: Address: SP Road, Bangalore – 560002, Email: [email protected], Phone: +91-8317437625 \|\| For bulk orders and support, please contact us via the details above.
Item Type Name	Yubico
Item Weight Unit of Measure	3 Grams
Manufacturer	Yubico : Patelcraft Solutions Private Ltd : Email Id : [email protected], Yubico : Patelcraft Solutions Private Ltd : Email Id : [email protected]
Manufacturer Contact Information	Yubico : Patelcraft Solutions Private Ltd : Email Id : [email protected]
Model Name	Y-291
Model Number	Y-291
Network Connectivity Technology	USB
Packer Contact Information	Yubico : Patelcraft Solutions Private Limited, Jaipur Office: Address: Devi Nagar, Jaipur – 302019, Email: [email protected], Phone: +91-7416733071 \| Bangalore Office: Address: SP Road, Bangalore – 560002, Email: [email protected], Phone: +91-8317437625 \|\| For bulk orders and support, please contact us via the details above.
Special Feature	Two-Factor Authentication, Dual Connectors, FIDO Certified
Unit Count	1 Count
Warranty Description	1 Year

Yubico YubiKey 5Ci - Two Factor Authentication Android/PC/iPhone Security Key, Dual Connectors for Lighting/USB-C - FIDO Certified USB Password Key, Protect Online Accounts with More Than a Password

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