By the way, usually it does not send you a code, though some do. More often it relies on a code generated by an authentication app on your phone.
I have one authentication app which automatically maintains current codes for Facebook, GMail, Outlook, etc. etc. etc. Should a website ask me, then I open the app and choose the code next to that site.
I've been running two-factor for the longest time. And on my home computer/browser there is one app which asks me every 30 days. Everything else is by exception and if I had to guess I;d say every three months or so one site or other asks me.
Of course, if I change computers or reinstall my browser, then every damn app asks me at least for the first time. Seems a small price.
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